Task 3

#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;

int main(){
    long long int a, b;
    cin >> a >> b;
    int g = -1;
    if (b < a){
        g = 1;
    }
    for (long long i = max(a, b); i > 0; i += max(a, b)){
        if (a > b){
            if ((i + 2) % b == 0){
                cout << i + 1 << endl;
                break;
            }
        }
        else{
            if ((i - 2) % 2 == 0){
                cout << i - 1;
                break;
            }
        }
    }
    system("pause");
    return 0;
}