#include <bits/stdc++.h>
int main() {
  int n[3], max, other;
  int i;
  scanf("%d%d%d", n + 0, n + 1, n + 2);
  other = n[0] + n[1] + n[2];
  max = n[0];
  if (max < n[1]) max = n[1];
  if (max < n[2]) max = n[2];
  other -= max;
  if (max = other)
    printf("Yes");
  else
    printf("No");
  return 0;
}
