#include <stdio.h>

int main(void) {
    int a, b;
    scanf("%d %d", &a, &b);
    int ans = 3;
    if (a <= 23 && 23 <= b) ans--;
    if (a <= 24 && 24 <= b) ans--;
    if (a <= 25 && 25 <= b) ans--;
    printf("%d\n", ans);
    return 0;
}