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