#include <iostream>
    using namespace std;
    int main()
    {
        int n1 = 20, n2 = 30, n3 = 60;
        float  Res;
        try
        {
            if ((n1 - n2) != 0)
            {
                Res = n3 / (n1 - n2);
                cout << Res;
            }
            else
            {
                throw(n1 - n2);
            }
        }
        catch (int k)
        {
            cout<<"Answer is infinite..."<< k;
        }
    }