#include <bits/stdc++.h>
int main(void) {
  int a, b, c, x, y;
  scanf("%d %d %d", &a, &b, &c);
  x = a + b;
  y = x - c;
  if (1 <= y) {
    printf("Yes\n");
  } else if (1 > y) {
    printf("No\n");
  }
  return 0;
}
