#include <bits/stdc++.h>
int main(void) {
  long data1, data2, data3;
  long sum, dist;
  scanf("%d %d %d", &data1, &data2, &data3);
  sum = data1 + data2;
  if ((data1 + data2 - data3) > 0) {
    printf("Yes");
  } else {
    printf("No");
  }
}
