#include <bits/stdc++.h>
using namespace std;
const int c_INF = 111111111;
const int c_mINF = -111111111;
const int c_YET = -1;
const int c_Dx[4] = {0, 0, 1, -1};
const int c_Dy[4] = {1, -1, 0, 0};
const int c_div = 1000000007;
int main() {
  int A, B, C;
  scanf("%d%d%d%d", &A, &B, &C);
  if (A + B * 2 >= C)
    printf("Yes");
  else
    printf("No");
}
