#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<cmath>
using ll = long long;
using namespace std;

int main(){
        int a,b,ans=3;
        cin >> a >> b;
        for(int i=23;i<=25;i++){
                if(a<=i&&i<=b) ans--;
        }
        cout << ans << endl;
        return 0;
}