#include <bits/stdc++.h>
int main() {
  int a, b, c, sum = 0, d;
  d = scanf("%d %d %d", &a, &b, &c);
  sum = a + b * 2;
  if (sum < c) {
    printf("No\n");
  } else {
    printf("Yes\n");
  }
  return 0;
}
