#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    int r = 31-a+1+b;
    if(r>=c) {
        cout << 1 << endl;
    }
    else if(r<c && r>=d) {
        cout << 2 << endl;
    }
    else{
        cout << 3 << endl;
    }
    return 0;
}