#include <stdio.h>
int main(void){
    int a, b;
    int sanka = 0;
    scanf( "%d %d", &a, &b );
    if( a > 25 ){
        sanka = 3;
    }else if( b < 23 ){
        sanka = 3;
    }else if( a == b && ( a >= 23 && b <= 25 ) ){
        sanka = 2;
    }else if( a == 23 && b == 24 ){
        sanka = 1;
    }else if( a == 24 && b == 25 ){
        sanka = 1;
    }else if( b == 23 ){
        sanka = 2;
    }else if( a == 25 ){
        sanka = 2;
    }
    printf( "%d", sanka );
}