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
*/