答案：

#include <iostream>
using namespace std;
int main()
{
    int n1, n2, n3, max;
    cin >> n1 >> n2 >> n3;
    max = (n1 > n2 > n3) ? n1 : n2;
	do
    {
        if (max % n1 == 0 && max % n2 == 0 && max % n3 == 0)
        {
            cout << max;
            break;
        }
        else
            ++max;
    } while (true);
    
    return 0;
}