#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main(){
    int n, x, m; cin >> n >> x >> m;
    vector<int> a(n);
    for(auto &it: a) cin >> it;

    int b = 1;
    for(int i = n-1; i >= 0; i--){
        while(a[i]/b >= x){
            if(m < i+1){
                cout << "No" << endl;
                return 0;
            }
            b *= 2;
            m -= i+1;
        }
    }
    cout << "Yes" << endl;
    return 0;
}