#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[7];
  int sum = 0;
  for (int i = 0; i < 6; i++) {
    scanf("%d", a + i);
    sum += a[i];
  }
  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]) * 2 == sum) {
          cout << "YES" << endl;
          return 0;
        }
  cout << "NO" << endl;
  return 0;
}
