uri- 1103 - Alarm Clock

#include <stdio.h>

int main(){
 int h, hm, hr,m,mm,i;

 for(i=0;i<10000;i++){

      scanf("%d %d %d %d", &h, &m,&hm,&mm);

  if(h==0 && m==0 && hm==0 && mm==0){
      break;
  }
   if (h <= hm)
            hr = (hm - h) * 60;
        else
            hr = (24 - (h - hm)) * 60;

        if (m <= mm)
            hr += mm - m;
        else
            hr += 60 - 60 - m + mm;

        if (h == hm &&  m > mm)
            hr = 23 * 60 + (60 - m + mm);

        printf("%d\n", hr);
    }
 return 0;
}