Can't figure out what's wrong. Btw its not TLE, im getting an entirely wrong output on a test case

[quick elbow]

https://codeforces.com/problemset/problem/476/A
`#include<iostream>
#include<cmath>
using namespace std;

int main(){
int n,m;
cin >> n >>m;
for(int i=1;i<=n/m;i++){
int q=im;
int h=n-q;
int k=n-(2h);
if(k>=0 && h>=0 && !(k==0 && h==0)){
cout << q;
return 0;
}
}
cout << -1;
return 0;
}
`

[sage topaz]

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[quick elbow]

i ran this thing locally and for any random number i enter my output matches with a certified correct solution

probably some edge case which im missing

[graceful mist]

#include <iostream>

int main() {
    int n, m;
    std::cin>>n>>m;

    int ms = (n + 1) / 2; 
    while(ms % m != 0)++ms;

    ms<=n ? std::cout<<ms : std::cout<<-1;
}