#include<iostream>
using namespace std;
char a[101][101]={};
int main()
{
    int r,c,k,s=0;
    cin>>r>>c>>k;
    for(int i=1;i<=r;i++)for(int j=1;j<=c;j++)cin>>a[i][j];
    for(int i=1;i<=r-k+1;i++)for(int j=1;j<=c;j++)for(int l=1;l<=k;l++){if(a[i+l-1][j]=='#')break;if(l==k)s++;}
    for(int i=1;i<=r;i++)for(int j=1;j<=c-k+1;j++)for(int l=1;l<=k;l++){if(a[i][j+l-1]=='#')break;if(l==k)s++;}
    cout<<s;
}

WA#4#5