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