#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const int N = 105;
ll T, a[N];
signed main(){
    int n, F; scanf("%d %d %lld", &n, &F, &T);
    ll tot = 0;
    for(int i = 0; i<n; ++i){
        scanf("%lld", a+i);
        tot += a[i];
    }
    if(tot < T){ puts("NO"); return 0;}
    ll tmp = 0;
    for(int i = 0; i<F; ++i) tmp += a[i];
    if(tmp >= T){ puts("0"); return 0;}
    puts("1");
}