View Code of Problem 3831

#include<string>
#include<cstring>
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<vector>
#include<cstring>
using namespace std;
//int a[1000][1000];
int cal(long long n)
{
	int sum = 0;
	while (n != 0)
	{
		sum += n % 10;
		n /= 10;
	}
	return sum;
}
int main()
{
	long long a, b, c, d;
	cin >> a >> b >> c >> d;
	int flag = 0;
	for (int i = 1;i <= 81;i++)
	{
		long long z = (i + a)*(i + b)*(i + c)*(i + d);
		if (cal(z) == i)
		{
			flag = 1;
			cout << z;
			break;
		}
	}
	if (flag == 0)
		cout << -1;
}