Sol

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)

signed main()
{
    fastio;
    /*
    // Junior B
    int n , k;
    cin >> n >> k;
    cout << min(n % k , k - n % k);
    */
    /*
    // Junior A
    int n , k;
    cin >> n >> k;
    int x = k / n , y = k % n;
    int sum = 0;
    if(x > 0){
        sum += k - n;
    }
    if(x < n - 1){
        sum += k + n;
    }
    if(y > 0){
        sum += k - 1;
    }
    if(y < n - 1){
        sum += k + 1;
    }
    cout << sum;
    */
    /*
    // Senior A
    int n , s , m , q;
    cin >> n >> s;
    int ans = 0;
    bool ok = false;
    for(int i = 0; i < n; i++){
        cin >> m >> q;
        if(m * 100 + q <= s * 100){
            ok = true;
            if(q != 0)
                ans = max(ans , 100 - q);
        }
    }
    if(!ok){
        cout << -1;
        return 0;
    }
    cout << ans;
    */
    /*
    // Senior B
    int n , k;
    cin >> n;
    bool used[n + 1] = {0};
    for(int i = 1; i <= n; i++){
        cin >> k;
        used[k] = 1;
    }
    for(int i = 1; i <= n; i++){
        if(!used[i]){
            cout << i;
            return 0;
        }
    }
    cout << -1;
    */
}