#include <bits/stdc++.h> using namespace std; #define int long long int int32_t main() { std::ios_base::sync_with_stdio(false); std::cin.tie(NULL); int n,m,d,k; cin>>n>>m>>d>>k; char grid[n][m]; vector<pair<int,int>>mus; for(int i=0;i<n;i++) { for(int j=0;j<m;j++){ cin>>grid[i][j]; if(grid[i][j]=='M') mus.push_back({i,j}); } } vector<vector<int>>p(n+1,vector<int>(m+1,0)); for(int i=1;i<=n;i++) { for(int j=1;j<=m;j++) { int s=0; if(grid[i-1][j-1]=='S') s=1; p[i][j]=p[i-1][j]+p[i][j-1]-p[i-1][j-1]+s; } }int ans=0; for(auto [i,j]:mus) { int r1=max(i-d,0LL); int c1=max(j-d,0LL); int r2=min(i+d,n-1); int c2=min(j+d,m-1); r1++;r2++;c2++;c1++; int a=p[r2][c2]-p[r1-1][c2]-p[r2][c1-1]+p[r1-1][c1-1]; if(a>=k) ans++; } cout<<ans<<endl; return 0; }