#include <bits/stdc++.h>
using namespace std;
int a[10];
int main() {
  int sum = 0;
  for (int i = 0; i < 6; i++) {
    cin >> a[i];
    sum += a[i];
  }
  if (sum % 2)
    cout << "NO\n";
  else {
    sum /= 2;
    int flag = 0;
    for (int i = 0; i < 6; i++) {
      for (int j = i + 1; j < 6; j++) {
        for (int k = j + 1; k < 6; k++) {
          if (a[i] + a[j] + a[k] == sum) flag = 1;
        }
      }
    }
    if (flag)
      cout << "YES\n";
    else
      cout << "NO\n";
  }
  return 0;
}
