#include <stdio.h>
#include <time.h>
#include <stdlib.h>

int main()
{
	const char *a="12:59", *b="13:12";
	
	struct tm x={.tm_mday=1,.tm_year=70,.tm_hour=atoi(a),.tm_min=atoi(a+3)},
			  y={.tm_mday=1,.tm_year=70,.tm_hour=atoi(b),.tm_min=atoi(b+3)};
	
	printf("%d", (int)difftime(mktime(&y),mktime(&x))/60);
	return 0;
}