a = float(input())
b = float(input())
c = float(input())
a = a + b
c = c - a
if abs(c) < 0.00000001:
    print("YES")
else:
    print("NO")

#include <bits/stdc++.h>

using namespace std;

int main()
{
    double a, b, c;
    cin >> a >> b >> c;
    a = a + b;
    c = c - a;
    if(abs(c) < 0.00000001)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}