Uva 414 Machined Surfaces

#include<stdio.h>#include<string.h>
int main()
{
  int n,i,j,min,sum;
  int count[20];
  while(scanf("%d",&n),n)
  {
    char ch;
    sum = 0;
    memset(count,0,sizeof(count));
    for(i=0; i<n; i++)
    {
      for(j=0; j<26; j++)
      if((ch=getchar())==' ')
        count[i]++;
      sum += count[i];
      if(i==0) min = count[i];
      else if(count[i]<min) min = count[i];
    }
    printf("%d\n",sum-min*n);
  }
  return 0;
}
/*
4
XXXX                XXXXX
XXX               XXXXXXX
XXXXX                XXXX
XX                 XXXXXX
2
XXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXX
1
XXXXXXXXX              XX
0
*/