#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int t;
    int b;
    int f;
    int c;
    cin >> t >> b >> f >> c;
    int n = t + 1;
    if (t + b + f + c > n * (n - 1) / 2) cout << -1;
   
    return 0;
}