#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
#include<unordered_map>
using namespace std;
int t;
int a;
int b;
int main(){
	scanf("%d%d%d", &t, &a, &b);
	int k = min(a, b) + max(a, b) - min(a, b);
	if (k > t){
		puts("NO");
		return 0;
	}
	puts("NO");
	return 0;
}