7193

static int N;
static char X[10000000 + 1 + 1];

static int solution(void)
{
	scanf("%d %s\n", &N, X);
	int len = strlen(X) - 1, ret = 0, div = N - 1;

	for (int i = len; i >= 0; i--)
		ret = (ret + (X[i] - '0')) % div;

	return ret;
}