#include <bits/stdc++.h>
#define int long long
#define ll long long
#define rep(i,n) for(int i=0;i<n;i++)
#define INF LLONG_MAX/3
#define eps LDBL_EPSILON
#define moder (1000000007)
#define pie acos(-1)
#define P std::pair<int,int>
#define prique priority_queue
#define ggr getchar();getchar();return 0;
using namespace std;
int a,b;
signed main(){
	cin>>a>>b;
	int ans=3;
	for(int i=23;i<=25;i++){
		if(a<=i&&i<=b)ans--;
	}
	cout<<ans<<endl;
	return 0;
}