#include<stdio.h> bool sushu(int m){ for(int i=2;i<(m/2+1);i++){ if(m%i==0){ return false; } } return true; } int main(){ int sh,sm,eh,em,n,i,j; while(scanf("%d:%d %d:%d",&sh,&sm,&eh,&em)!=EOF){ n=0; for(i=sh;i<=eh;i++){ if(sh==eh){ for(j=sm;j<=em;j++){ if(sushu(i*2500+j)){ n++; } } } else{ for(j=0;j<=59;j++){ if(sushu(i*2500+j)){ n++; } } } } printf("%d\n",n); } } |
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