#include <stdio.h>
#include <math.h>
#define DEBUG3

#define NOP do{}while(0)
#ifdef DEBUG
#define TRACE(...) do{printf(__VA_ARGS__);fflush(stdout);}while(0)
#define TRACECR do{printf("\n");fflush(stdout);}while(0)
#else
#define TRACE(...) NOP
#define TRACECR NOP
#endif
int main( void ) {
    int hh,mm;
    long s,a;
	int	i;

    scanf("%d %d", &hh, &mm );
    a = hh * 3600 + mm * 60;
	for(i=0; i*43200/11 < a ; i++ );
	s = i * 43200 /11;
    printf("%ld\n", s-a  );
    return 0;
}