#include<stdio.h>

int main()
{

unsigned sat,minut,sekund,nar_pop;
scanf("%u%u%u",&sat,&minut,&sekund);

if(sat<0 || sat>23 || minut<0 || minut>59 || sekund<0 || sekund>59){
 printf("-1\n");
 return -1;
}

if(sat<12){
  nar_pop=(12-sat)*3600-minut*60-sekund;
  printf("%u\n",nar_pop);
  return 0;
}
else{
 nar_pop=(24-sat)*3600-minut*60-sekund;
 printf("%d\n",12*3600+nar_pop);
 return 0;
}

return 0;
}
