#include <stdio.h>

int main()
{
	int A, B, D, Sum;
	scanf("%d %d %d", &A, &B, &D);
	Sum = A + B;

	/* calculate the bits of Sum */
	int power = 1;
	/* use Sum / D >= power to avoid using long int */
	while (Sum / D >= power)
		power *= D;

	/* calculate D-base number. print them on-the-fly */
	for (; power > 0; Sum %= power, power /= D)
		printf("%d", Sum / power);

	return 0;
}