C :

#include <stdio.h>
int main ()
{
	//freopen("a.in","r",stdin);
	//freopen("a.out","w",stdout);
	int n;
	while(scanf("%d",&n) != EOF)
	{
		printf("%o\n",n);
	}
	return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    while(~scanf("%d",&n)){
        printf("%o\n",n);
    }
    return 0;
}