Προβλημα με περίοδο

Question

&Kappa;&alpha;&lambda;&eta;&sigma;&pi;έ&rho;&alpha; &sigma;&alpha;&sigmaf;.&tau;&omicron;&nu; &Phi;&epsilon;&beta;&rho;&omicron;&upsilon;ά&rho;&iota;&omicron; &epsilon;ί&chi;&alpha; &epsilon;&lambda;&epsilon;ύ&theta;&epsilon;&rho;&eta; &epsilon;&pi;&alpha;&phi;&eta; &mu;&epsilon; &tau;&omicron;&nu; &sigma;ύ&nu;&tau;&rho;&omicron;&phi;&omicron; &mu;&omicron;&upsilon; &mu;&iota;&alpha; &mu;&epsilon;&rho;&alpha; &alpha;&phi;&omicron;&upsilon; &mu;&omicron;&upsilon; &tau;&epsilon;&lambda;&epsilon;ί&omega;&sigma;&epsilon; &eta; &pi;&epsilon;&rho;ί&omicron;&delta;&omicron;&sigmaf; &kappa;&alpha;&iota; &mu;&epsilon;&tau;&alpha; &alpha;&pi;&omicron; 5 &mu;&epsilon;&rho;&epsilon;&sigmaf; ά&rho;&chi;&iota;&sigma;&epsilon; &nu;&alpha; &pi;&rho;&eta;&zeta;&epsilon;&tau;&alpha;&iota; &kappa;&alpha;&iota; &nu;&alpha; &pi;&omicron;&nu;ά&epsilon;&iota; &tau;&omicron; &sigma;&tau;&eta;&theta;&omicron;&sigmaf; &mu;&omicron;&upsilon; &mu;&epsilon;&chi;&rho;&iota; &kappa;&alpha;&iota; &tau;&eta;&nu; &epsilon;&pi;ό&mu;&epsilon;&nu;&eta; &pi;&epsilon;&rho;&iota;&omicron;&delta;&omicron; &mu;&omicron;&upsilon; &delta;&eta;&lambda;&alpha;&delta;&eta; &tau;&eta;&nu; &pi;&epsilon;&rho;ί&omicron;&delta;&omicron; &tau;&omicron;&upsilon; &Mu;&alpha;&rho;&tau;ί&omicron;&upsilon;.&alpha;&pi;&omicron; &tau;&omicron;&tau;&epsilon; &sigma;&epsilon; &kappa;&alpha;&mu;&iota;&alpha; &alpha;&pi;&omicron; &tau;&iota;&sigmaf; &epsilon;&pi;ό&mu;&epsilon;&nu;&epsilon;&sigmaf; &pi;&epsilon;&rho;&iota;ό&delta;&omicron;&upsilon;&sigmaf; &mu;&omicron;&upsilon; &delta;&epsilon;&nu; &epsilon;&chi;&epsilon;&iota; &xi;&alpha;&nu;&alpha;&pi;&omicron;&nu;&epsilon;&sigma;&epsilon;&iota; &tau;&omicron; &sigma;&tau;&eta;&theta;&omicron;&sigmaf; &mu;&omicron;&upsilon; &omicron;&upsilon;&tau;&epsilon; &sigma;&tau;&omicron; &epsilon;&lambda;ά&chi;&iota;&sigma;&tau;&omicron; &pi;&rho;ά&gamma;&mu;&alpha; &pi;&omicron;&upsilon; &delta;&epsilon;&nu; &mu;&omicron;&upsilon; &epsilon;&chi;&epsilon;&iota; &xi;&alpha;&nu;ά&sigma;&upsilon;&mu;&beta;&epsilon;ί &pi;&alpha;&lambda;&alpha;&iota;ό&tau;&epsilon;&rho;&alpha;.&pi;&rho;&iota;&nu; &alpha;&pi;&omicron; 4 &eta;&mu;έ&rho;&epsilon;&sigmaf; &delta;&eta;&lambda;&alpha;&delta;&eta; 23/08 &epsilon;ί&chi;&alpha; &pi;&alpha;&lambda;&iota; &epsilon;&lambda;&epsilon;ύ&theta;&epsilon;&rho;&eta; &epsilon;&pi;&alpha;&phi;ή &kappa;&alpha;&theta;ώ&sigmaf; &nu;&omicron;&mu;&iota;&zeta;&alpha; &omicron;&tau;&iota; ή&mu;&omicron;&upsilon;&nu; &sigma;&tau;&iota;&sigmaf; &gamma;ό&nu;&iota;&mu;&epsilon;&sigmaf; &mu;&epsilon;&rho;&epsilon;&sigmaf; &alpha;&phi;&omicron;&upsilon; &epsilon;ί&chi;&alpha; &pi;&alpha;&rho;&alpha;&tau;&eta;&rho;&eta;&sigma;&epsilon;&iota; &tau;&alpha; &alpha;&nu;&tau;&iota;&sigma;&tau;&omicron;&iota;&chi;&alpha; &upsilon;&gamma;&rho;ά &tau;&eta;&sigmaf; &omega;&omicron;&rho;&rho;&eta;&xi;&iota;&alpha;&sigmaf; &kappa;&alpha;&iota; &sigma;&eta;&mu;&epsilon;&rho;&alpha; 27/08 &mu;&omicron;&upsilon; ή&rho;&theta;&epsilon; &pi;&epsilon;&rho;ί&omicron;&delta;&omicron;&sigmaf; &pi;&alpha;&lambda;&iota; &chi;&omega;&rho;ί&sigmaf; &pi;&omicron;&nu;&omicron; &sigma;&tau;&omicron; &sigma;&tau;&eta;&theta;&omicron;&sigmaf; &eta; &sigma;&tau;&eta;&nu; &kappa;&omicron;&iota;&lambda;&iota;ά &kappa;&alpha;&iota;  &nu;&omega;&rho;ί&tau;&epsilon;&rho;&alpha; &alpha;&pi;&omicron;&tau;&iota; &tau;&eta;&nu; &pi;&epsilon;&rho;ί&mu;&epsilon;&nu;&alpha; &tau;&omicron; &alpha;&kappa;&rho;&iota;&beta;ώ&sigmaf; &delta;&epsilon;&nu; &mu;&pi;&omicron;&rho;&omega; &nu;&alpha; &tau;&omicron; &pi;&rho;&omicron;&sigma;&delta;&iota;&omicron;&rho;ί&sigma;&omega; &gamma;&iota;&alpha;&tau;&iota; &delta;&epsilon;&nu; &epsilon;&chi;&omega; &Sigma;&tau;&alpha;&theta;&epsilon;&rho;&omicron; &kappa;ύ&kappa;&lambda;&omicron; &alpha;&lambda;&lambda;&alpha; &kappa;&upsilon;&mu;&alpha;ί&nu;&epsilon;&tau;&alpha;&iota; &alpha;&pi;&omicron; 24 &mu;&epsilon;&chi;&rho;&iota; 29 &eta;&mu;έ&rho;&epsilon;&sigmaf;.&gamma;&iota;&alpha; &pi;&alpha;&rho;ά&delta;&epsilon;&iota;&gamma;&mu;&alpha; &eta; &pi;&rho;&omicron;&eta;&gamma;&omicron;&upsilon;&mu;&epsilon;&nu;&eta; &pi;&epsilon;&rho;ί&omicron;&delta;&omicron;&sigmaf; &mu;&omicron;&upsilon; ή&rho;&theta;&epsilon; 29 &mu;&epsilon;&rho;&epsilon;&sigmaf; &mu;&epsilon;&tau;&alpha; &kappa;&alpha;&iota; &eta; &tau;&omega;&rho;&iota;&nu;ή 24.&theta;&epsilon;&lambda;&omega; &nu;&alpha; &rho;&omega;&tau;ή&sigma;&omega; &alpha;&nu; &pi;&iota;&sigma;&tau;&epsilon;ύ&epsilon;&tau;&epsilon; &pi;&omega;&sigmaf; &epsilon;&chi;&omega; &kappa;&alpha;&pi;&omicron;&iota;&omicron; &pi;&rho;&omicron;&beta;&lambda;&eta;&mu;&alpha; &alpha;&phi;&omicron;&upsilon; &delta;&epsilon;&nu; &pi;&rho;&eta;&zeta;&epsilon;&tau;&alpha;&iota; &tau;&omicron; &sigma;&tau;&eta;&theta;&omicron;&sigmaf;  &kappa;&alpha;&iota;  &alpha;&phi;&omicron;&upsilon; &delta;&epsilon;&nu; &epsilon;&chi;&omega; &Sigma;&tau;&alpha;&theta;&epsilon;&rho;&omicron; &kappa;ύ&kappa;&lambda;&omicron;  &kappa;&alpha;&iota; &alpha;&nu; &alpha;&upsilon;&tau;&omicron; &epsilon;&pi;&eta;&rho;&epsilon;ά&zeta;&epsilon;&iota; &tau;&eta;&nu; &gamma;&omicron;&nu;&iota;&mu;ό&tau;&eta;&tau;&alpha; &mu;&omicron;&upsilon;.&sigma;&alpha;&sigmaf; &epsilon;&upsilon;&chi;&alpha;&rho;&iota;&sigma;&tau;&omega; &epsilon;&kappa; &tau;&omega;&nu; &pi;&rho;&omicron;&tau;έ&rho;&omega;&nu; &kappa;&alpha;&iota; &sigma;&upsilon;&gamma;&nu;&omega;&mu;&eta; &alpha;&nu; &sigma;&alpha;&sigmaf; &kappa;&omicron;ύ&rho;&alpha;&sigma;&alpha;