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

int main(){
    int n,x,m;cin>>n>>x>>m;
    vector<int> A(n);
    int cost = 0;
    for(int i = 0; n > i; i++)cin>>A[i];
    int nw = 1;
    for(int i = n-1; 0 <= i; i--){
        while(x <= A[i]/nw){
            nw *= 2;
            cost += i+1;
        }
    }
    if(cost > m)cout << "No" << endl;
    else cout << "Yes" << endl;
}