#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

bool tr(int a, int b, int c)
{
    if(a + b > c && a + c > b && c + b > a)
        return true;
    return false;
}

bool seg(int a, int b, int c)
{
    if(a + b == c || a + c == b || c + b == a)
        return true;
    return false;
}

int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    if(tr(a, b, c) || tr())
    return 0;
}