Submission #19557712

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Source Code Expand

#include <bits/stdc++.h>
#include <atcoder/segtree.hpp>
/*
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using Bint = mp::cpp_int;// 任意長整数型
*/
#define rep(i,n) for(int i=0; i<n; i++)
#define Rep(i,j,n) for(int i=j; i<n; i++)
#define PI 3.14159265359
#define INFL 1000100100000000000
#define INF 1000100100
#define MOD 1000000007
#define all(x) (x).begin(),(x).end()
typedef long long ll;
#define P pair<int, int>
#define PL pair<ll, ll>
#define PD pair<T,vector<int> >
#define T tuple<int,int,int> 
#define TL tuple<ll,ll,ll> 
using namespace std;
using namespace atcoder;

int main(){
  ll x,y; cin >> x >> y;
  if(x%y==0) cout << -1 << endl;
  else cout << x*y-x << endl;
  return 0;
}

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