> #include <stdio.h>
> #include <iostream>
> #include <fstream>
> using namespace std;
> 
> int height[1000];
> int n,m;
> int cmp(const void *a1,const void *a2){
> 	return ( *(int *)a1-*(int *)a2   );
> }
> 
> void main(){
> //	ifstream cin("data.txt");
> 	int testcase=1;
> 	while(1){
> 		cin>>n>>m;
> 		if(n==0)break;
> 		memset(height,0,sizeof(height));
> 		for(int i=0;i<=n*m-1;i++){
> 			cin>>height[i];
> 		}
> 		qsort(height,n*m,sizeof(int),cmp);
> 		int sum;
> 		cin>>sum;
> 		double ave=(double)sum/100;
> 		for(i=1;i<n*m;i++){
> 			double tmp=0;
> 			for(int j=0;j<i;j++){
> 				tmp+=height[i]-height[j];
> 			}
> 			if(ave<=tmp){
> 				double t=(double)1.0*(tmp-ave)/i;
> 				printf("Region %d\n",testcase++);
> 				printf("Water level is %.2lf meters.\n",height[i]-t);
> 				printf("%.2lf percent of the region is under water.\n",(double)100.0*i/(n*m));
> 				break;
> 			}
> 		}
> 		
> 	}
> 
> }