Πρόβλημα περιόδου

Question

&Epsilon;ί&mu;&alpha;&iota; &kappa;&omicron;&pi;έ&lambda;&alpha; 26 &epsilon;&tau;ώ&nu; &kappa;&alpha;&iota; &pi;&rho;&iota;&nu; 1,5 &chi;&rho;ό&nu;&omicron; &delta;&iota;&alpha;&pi;&iota;&sigma;&tau;ώ&theta;&eta;&kappa;&epsilon; &kappa;&alpha;&iota; &omicron;&rho;&mu;&omicron;&nu;&iota;&kappa;ά ό&tau;&iota; έ&chi;&omega; &pi;&omicron;&lambda;&upsilon;&kappa;&upsilon;&sigma;&tau;&iota;&kappa;&epsilon;&sigmaf; lh &mu;&epsilon;&gamma;&alpha;&lambda;ύ&tau;&epsilon;&rho;&eta; &alpha;&pi;ό fsh &kappa;&alpha;&iota; &tau;&epsilon;&sigma;&tau;&omicron;&sigma;&tau;&epsilon;&rho;ό&nu;&eta; &epsilon;&lambda;ά&chi;&iota;&sigma;&tau;&alpha; &pi;&iota;&omicron; &pi;ά&nu;&omega; &alpha;&pi;ό &tau;&omicron; ό&rho;&iota;&omicron; ό&pi;&omega;&sigmaf; &kappa;&alpha;&iota; &pi;&rho;&omicron;&lambda;&alpha;&kappa;&tau;ί&nu;&eta; &epsilon;&mu;έ&nu;&alpha; ό&mu;&omega;&sigmaf; έ&pi;&epsilon;&iota;&tau;&alpha; &alpha;&pi;ό &delta;&iota;&alpha;&tau;&alpha;&rho;&alpha;&chi;έ&sigmaf; &sigma;&tau;&omicron;&nu; &kappa;ύ&kappa;&lambda;&omicron; &mu;&epsilon;&iota;ώ&theta;&eta;&kappa;&epsilon; &kappa;&alpha;&iota; &eta; &rho;&omicron;ή &kappa;&alpha;&iota; &kappa;ά&pi;&omicron;&iota;&omicron;&upsilon;&sigmaf; &mu;ή&nu;&epsilon;&sigmaf; &delta;&iota;&alpha;&rho;&kappa;&epsilon;ί 3-4 &eta;&mu;έ&rho;&alpha; &mu;&epsilon; &lambda;ί&gamma;&eta; &rho;&omicron;ή &alpha;&nu;&tau;ί &gamma;&iota;&alpha; 5 &mu;&epsilon;&rho;&epsilon;&sigmaf; &mu;&epsilon; &phi;&upsilon;&sigma;&iota;&omicron;&lambda;&omicron;&gamma;&iota;&kappa;ή &rho;&omicron;ή &gamma;&iota;&alpha;&tau;ί &sigma;&upsilon;&mu;&beta;&alpha;ί&nu;&epsilon;&iota; &alpha;&upsilon;&tau;ό???? &Delta;&epsilon;&nu; &kappa;ά&nu;&omega; &omega;&omicron;&rho;&rho;&eta;&xi;ί&alpha; ό&tau;&alpha;&nu; &eta; lh &epsilon;ί&nu;&alpha;&iota; &mu;&epsilon;&gamma;&alpha;&lambda;ύ&tau;&epsilon;&rho;&eta; &alpha;&pi;ό &tau;&eta;&nu; fsh? &Phi;&tau;&alpha;ί&epsilon;&iota; &eta; &tau;&epsilon;&sigma;&tau;&omicron;&sigma;&tau;&epsilon;&rho;ό&nu;&eta;? &Delta;&iota;&alpha;&phi;&omega;&tau;&iota;&sigma;&tau;&epsilon;&mu;&epsilon;