#include<algorithm>
#include<iostream>
#include<vector>
using namespace std;
typedef long long lint;
typedef vector<int>vi;
typedef pair<int,int>pii;
#define rep(i,n)for(int i=0;i<(int)(n);++i)

int main(){
  int n,m,x;
  cin>>n>>m>>x;
  cout<<(x-n+m>=3?"YES":"NO")<<endl;
}