#include <cstdio>

char x;
int R[16][16], S[16], n, i, j, sol;

int main() {
	
	FILE *f = fopen("copii.in", "r");
	FILE *g = fopen("copii.out", "w");
	
	/*fscanf(f, "%d", &n);
	for (i = 1; i <= n; i++) {
		fscanf(f, "\n");
		for (j = 1; j <= n; j++) {
			fscanf(f, "%c", &x);
			R[i][j] = x - 48;
		}
	}
	
	back(1, 0);*/
	
	fprintf(g, "0");
	
	fclose(f); fclose(g);
	
	return 0;
}