文件目录

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    if (a < b)
        swap(a, b);
    if (a < c)
        swap(a, c);
    if (b + c > a)
        cout << "yes";
    else
        cout << "no";
    return 0;
}