# Machined Surfaces

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 This problem has been solved by mlc413.

 Sorter: mlc413 Unknown http://acm.pku.edu.cn/JudgeOnline/problem?id=1493

Machined Surfaces is problem number 1493 on the Peking University ACM site.

```import java.util.*;

public class Main{

public static Scanner in;

public static void main(String[] args){
in=new Scanner(System.in);

doStuff();
}

public static void doStuff(){
int N=in.nextInt();

while(N  != 0){
in.nextLine();
solve(N);
N=in.nextInt();
}
}

public static void solve(int N){
String inline;
int maxlen = 0; //Maximal number of Xs in a line
int[][] machine = new int[25][N];
int [] numXs = new int[N];

//read input and determine length of closed machine
for(int i =0; i < N; i++){
inline = in.nextLine();
int tmplen = 0;
for(int j =0; j < 25; j++){
machine[j][i] = inline.charAt(j);
if(machine[j][i] == 'X') tmplen++;
}
numXs[i] = tmplen;
if(tmplen>maxlen) maxlen = tmplen;
}

int innerspace = 0;
for(int i = 0; i < N; i++){
innerspace += maxlen - numXs[i];
}

System.out.println(innerspace);
}
}

```