#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>

using namespace std;

long calc(long x){


	int num[]={6,2,5,5,4,5,6,3,7,6};
	long res=0;
	do{
		res+=num[x%10];
		x/=10;
	}while(x>0);

	return res;

}

int main()
{	
	int n;
	cin>>n;

	long res=0;
	for(long i=0;i<1000000;i++){
		if(n>=calc(i)) res=max(res,i);
	}

	cout<<res<<endl;

	return 0;

}