#include <bits/stdc++.h>
int main() {
  int a, b, c, d;
  scanf("%d %d %d", &a, &b, &c);
  while (1 <= a, b, c <= 100) {
    d = a + b + c;
    if (d % 2 == 0) {
      printf("yes");
    } else {
      printf("no");
    }
    break;
  }
  return 0;
}
