#include <cstdio>#include <cstring>#include <cstdlib>#include <iostream>#include <algorithm>#include <cmath>#include <set>#include <queue>#include <stack>#include <map>#include <vector>using namespace std;typedef long long ll;typedef unsigned long long ull;typedef pair<int, int> P;const int maxn = 20;ll a[1000];int main(){    //freopen("in.txt", "r", stdin);    //freopen("out.txt", "w", stdout);    for(int t = 1;; t++)    {        int n, m;        ll v;        scanf("%d%d", &n, &m);        if(n == 0 && m == 0)            break;        int tot = n*m;        for(int i = 0; i < tot; i++)            scanf("%lld", &a[i]);        scanf("%lld", &v);        sort(a, a + tot);        int cnt = 0;        ll sum = 0;        for(int i = 0; i < tot; i++)        {            if(i == tot - 1)            {                sum += a[i];                cnt = tot;                break;            }            sum += a[i];            cnt++;            if(a[i+1] * 100 * cnt - sum * 100 >= v)                break;        }        double ans = (double)(v + sum * 100) / cnt / 100;        printf("Region %d\n", t);        printf("Water level is %.2f meters.\n", ans);        printf("%.2f percent of the region is under water.\n", (double)cnt/tot*100);        printf("\n");    }    return 0;}