#include <stdio.h>

void chmin(long long* a, long long b)
{
	if (*a > b) *a = b;
}

int main()
{
	long long P, Q, x, y;
	scanf("%lld %lld %lld %lld", &P, &Q, &x, &y);
	
	long long inv = y, ans, tmp;
	do {
		for (tmp = inv; tmp % 10 == 0; tmp /= 10);
		for (ans = tmp % 10, tmp /= 10; tmp > 0; ans = ans * 10 + tmp % 10, tmp /= 10);
		if (ans % P != 0) break;
	} while (1);
	
	printf("%lld", ans);
	for (tmp = ans; tmp % P != x; tmp = tmp * 10 % P) printf("0");
	printf("\n");
	fflush(stdout);
	return 0;
}