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

int main(){
	char NUM[] = {'4', '7'};
	int T;
	cin>>T;
	for (int t = 0; t < T; t++){
		int K;
		stack<int> stk;
		cin>>K;
		K++;
		while (K){
			stk.push(K % 2);
			K /= 2;
		}
		stk.pop();
		while (!stk.empty()){
			cout<<NUM[stk.top()];
			stk.pop();
		}
		cout<<endl;
	}
	
	return 0;
}