#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define LL long long
int s[100100];
int main()
{
	int m,a,b;
	LL n;
	int k;
	while(scanf("%d",&m),m)
	{
		scanf("%d%d",&a,&b);
		n=a+b;
		if(n<=0)
		{
			printf("0\n");
			continue;
		}
		LL x=n;
		k=0;
		memset(s,0,sizeof(s));
		while(x)
		{
			s[k++]=x%m;
			x/=m;
		}
		for(int i=k-1;i>=0;i--)
	    	printf("%d",s[i]);
	    printf("\n");
	}
	return 0;
}