View Code of Problem 3831

#include<stdio.h>

int S(int x) {
	int res = 0;
	while (x != 0) {
		res += x % 10;
		x /= 10;
	}
	return res;
}

int main() {
	int a, b, c, d;
	int end = ceil(sqrt(sqrt(1000000000)));
	while (scanf("%d %d %d %d", &a, &b, &c, &d) != EOF) {
		for (int i = 1;i <= end;i++) {
			int x = (i + a)*(i + b)*(i + c)*(i + d);
			if (S(x) == i) {
				printf("%d\n", x);
				break;
			}
			if (i == 81) {
				printf("-1\n");
			}
		}
	}
}