View Code of Problem 120

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<stdlib.h>
int isprim(int x){
	int i=2;
	for(i=2;i<=sqrt(x);i++){
		if(x%i==0){
			return 0;
		}
	}
	return 1;
}
int main() {
	int H1,M1,i,H2,M2,start,end,locaH,locaM,count;
	while(scanf("%d:%d %d:%d",&H1,&M1,&H2,&M2)!=EOF){
		start=H1*60+M1;
		end=H2*60+M2;
		count=0;
		for(i=start;i<=end;i++){
			locaH=i/60;
			locaM=i-locaH*60;
			if(isprim(locaH*2500+locaM)==1){
				count++;
			}
		}
		printf("%d\n",count);
	}
	
	return 0;
}