# include <iostream>
using namespace std;
int main(){
    int n,k,ans = 0;
    cin >> n >> k;
    for (int i = 1;i <= n;i ++){
        ans ++;
        if (i % k == 0) ans ++;
    }
    cout << ans;
    return 0;
}

https://www.luogu.com.cn/record/100733335

只需要错误点及改正方法