int printf(char* format, ...);
int putchar(int ch);

int a[9];

int ok(int x, int y) {
    for (int i = 1; i <= x - 1; ++i) {
        if (a[i] == y || a[i] - i == y - x || a[i] + i == y + x) {
            return 0;
        }
    }
    return 1;
}

void queen(int x) {
    if (x > 8) {
        a[0]++;
        return;
    }
    for (int y = 1; y <= 8; ++y) {
        if (ok(x, y)) {
            a[x] = y;
            queen(x + 1);
            a[x] = 0;
        }
    }
}

int main() {
    queen(1);
    printf("%d\n", a[0]);
}