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

using namespace std;

long calc(long x){

	char s[100];
	sprintf(s,"%ld",x);

	long res=0;
	int num[]={6,2,5,5,4,5,6,3,7,6};
	for(int i=0;i<strlen(s);i++){
		res+=num[s[i]-'0'];
	}

	return res;

}

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

	long res=0;
	for(long i=0;i<10000000;i++){
		if(n>=calc(i)) res=max(res,i);
	}

	cout<<res<<endl;

	return 0;

}