#include <iostream>
#include <string>

using namespace std;
int figurate(int num, int sides){
    if (sides == 3){
        if(num == 1){
            return num;
        }
        else if(num>=2){
            num + figurate(num-1,sides);
        }
    }
    else if (sides == 4){
        return num*num;
    }
    else if (sides == 5){
        if(num == 1){
            return num;
        }
        else if(num>=2){
            num + 2*(num-1) + figurate(num-1,sides);
        }
    }
    return -1;
}