#include <iostream>
using namespace std;
int main()
{
	int n;
	cout<<"請輸入數字:";
	cin>>n;
	while(n>0)
	{
		int A[50]={0},c=0;
		while(n)
		{
			A[c++]=n%7;
			n/=7;
		}
		cout<<"7進位是:";
		for(int i=c-1;i>-1;i--)
		{
			cout<<A[i];
		}
		cout<<endl;
		cout<<"請輸入數字:";
		cin>>n;
	}
	return 0;
}