//AT769音乐游戏
#include<iostream>
#include<cstring>
using namespace std;
string a[1005];
int main()
{
int n;
scanf("%d", &n);
int ans = 0;
for(int i=1; i<=n; i++)
{
cin >> a[i];
//用scanf("%s", &a[i]);只能输入一行字符
for(int j=0; j<9; j++)
{
if( a[i][j] == 'x' || ( a[i][j] == 'o' && a[i-1][j] != '0' ))
{
ans++;
}
}
}
printf("%d", ans);
return 0;
}