#include <iostream>
#include<cstring>
#include<string>
#include<cmath>
#include<algorithm>
#include<cctype>
#include<queue>
#include<stack>
#include<stdio.h>
#include<vector>
#include<set>
#include<map>
#include<iomanip>
#define rep(i,n) for(int i=0;i<n;i++)
typedef int long long ll;

using namespace std;
int main(){
    int a,b;
    cin>>a>>b;
    int hi[32];
    memset(hi,0,sizeof(hi));
    for(int i=a;i<b+1;i++){
        hi[i]=1;
    }
    int ans=3-hi[23]-hi[24]-hi[25];
    cout<<ans<<endl;





return 0;
}