AC code:

#include<queue>
#include<math.h>
#include<stdio.h>
#include<iostream>
#include<vector>
#include<iomanip>
#include<string.h>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<utility>
#include<cstring>
#include<stack>
#include<fstream>
#include<string>
using namespace std;
typedef long long ll;
const int MAX_N = 1e4 + 10;
const int INF = 0x3f3f3f3f;
string n[MAX_N];
string s = "01234567";
long long a , b , c , d , e , f , g;
int main()
{
	cin >> a;
	while ( a > 0 )
	{
		n[++b] = s[ a % 8 ];
		a /= 8;
	}
	for ( int i = b ; i >= 1 ; i-- )
	{
		cout << n[i]; 
	} 
	return 0;
}

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