#include<iostream>
#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define IO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
const int N = 100 + 5, inf = 2e9;

void doWork() {
    int n, c, y;
    ll b = 0;
    cin >> n >> c >> y;

    int a = 0;
    set<int> vis;
    for (int i = 1; i <= n; i++) {
        int x;
        cin >> x;
        b += x;
        if (i != c) {
            vis.insert(x % (y + 1));
            a = max(a, x);
        }
    }
    if (vis.size() == 1) {
        cout << a << " " << b + 1ll * a * (y - n + 1);
    } else {
        cout << "impossible";
    }
}

int main() {
    //IO
    int t = 1;
    //   cin >> t;
    for (int i = 1; i <= t; i++) {
        //  cout << "Case #" << i << ": ";
        doWork();
    }
}