#include <bits/stdc++.h> using namespace std; signed main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); int n, m, d, k; cin >> n >> m >> d >> k; string tb[n + 1]; int pf[n + 1][m + 1]; memset(pf, 0, sizeof pf); for(int i = 1;i<=n;i++){ cin >> tb[i]; tb[i] = " " + tb[i]; for(int j = 1;j<=m;j++){ pf[i][j] = (tb[i][j] == 'S') + pf[i - 1][j] + pf[i][j - 1] - pf[i - 1][j - 1]; } } int ans = 0; for(int i = 1;i<=n;i++){ for(int j = 1;j<=m;j++){ if(tb[i][j] == 'M'){ int top = min(n, i + d), bt = max(1, i - d), r = min(m, j + d), l = max(1, j - d); if(pf[top][r] - pf[top][l - 1] - pf[bt - 1][r] + pf[bt - 1][l - 1] >= k) ++ans; } } } cout << ans; }