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public static void main(String[] args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        String[] str = br.readLine().split("\\s+");

        int n = Integer.parseInt(str[0]);
        int m = Integer.parseInt(str[1]);
        int k = Integer.parseInt(str[2]);

        char[][] matrix = new char[n][m];

        for(int i=0;i<n;i++){
            matrix[i]=br.readLine().toCharArray();
        }

        List<Integer> block = new ArrayList<>();
        for(int j = 0;j<m;j++){
            int current = 0;
            for(int i=0;i<n;i++){
                if(matrix[i][j]=='o'){
                    current++;
                }else{
                    if(current>=2){
                        block.add(current);
                    }
                    current = 0;
                }
            }

            if(current>=2){
                block.add(current);
            }
        }

        Collections.sort(block,Collections.reverseOrder());

        int score = 0;

        for(int len:block){
            if(k==0){
                break;
            }

            int cell = Math.min(k, len);
            if(cell>=2){
                score += cell-1;
            }
            k-=cell;
        }

        out.println(score);
        out.flush();
        out.close();
        br.close();
        
    }