// Slower C++ solution:
#include<iostream>

#include<cstdio>

#include<cstring>

#include<queue>

using namespace std;



const int DIRECTSIZE = 4;

struct _direct {

    int drow;

    int dcol;

} direct[DIRECTSIZE] = {{0, -1}, {0, 1}, {-1, 0}, {1, 0}};



const int N = 1000;

const int N2 = 10;

char grid[N][N], visited[N][N];

int h, w, n;

struct _factory {

    int row;

	int col;

} factory[N2];



struct _node {

    int row;

	int col;

	int level;

};



int bfs(int n, char goal) {

    memset(visited, 0, sizeof(visited));

    _node start={factory[n-1].row, factory[n-1].col, 0}, temp;

    visited[start.row][start.col] = 1;

    queue<_node> q;

    q.push(start);

    while(!q.empty()) {

        _node front = q.front();

        q.pop();

        for(int i=0; i<DIRECTSIZE; i++) {

            int nextrow = front.row + direct[i].drow;

            int nextcol = front.col + direct[i].dcol;

            if( 0 <= nextrow && nextrow < h && 0 <= nextcol && nextcol < w) {

                if(grid[nextrow][nextcol] == goal) {

                    return front.level + 1;

                }

				else if(visited[nextrow][nextcol] == 0 && grid[nextrow][nextcol] != 'X') {

                    visited[nextrow][nextcol] = 1;

                    temp.row = nextrow;

                    temp.col = nextcol;

                    temp.level = front.level + 1;

                    q.push(temp);

                }

            }

        }

    }

    return 0;

}



int main() {

    while (~scanf("%d %d %d", &h, &w, &n)){

        for(int i = 0; i < h; i++) {

			scanf("%s", grid[i]);

            for(int j = 0; j < w; j++) {

                if(grid[i][j] == 'S') {

                    factory[0].row = i;

                    factory[0].col = j;

				}

				else if(isdigit(grid[i][j])) {

                    factory[grid[i][j] - '0'].row = i;

                    factory[grid[i][j] - '0'].col = j;

                }

            }

		}

        int minstep = 0;

        char goal = '1';

        for(int i=1; i<=n; i++) {

            minstep += bfs(i, goal);

            goal++;

        }

        printf("%d\n", minstep);

    }

    return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.9778058779645966x):
#include <iostream>

#include <queue>



using namespace std;



char mp[1005][1005];

int vis[1005][1005];

int w, h, n;



int dirs[4][2] = {{-1, 0}, {0, 1}, {1, 0}, {0, -1}};

int ans = 0, sx, sy;

int blood = 1;



struct Node{

	int x,y;

	Node(int _x, int _y){

		x = _x, y = _y;

	}

}; 

typedef struct Node Node; 



queue<Node> que;



void bfs(char t){

//	cout<<"sx = "<<sx<<", sy = "<<sy<<endl;

	que.push(Node(sx, sy));

	ans = 0;

	bool flag = true;

	while(!que.empty()){

//		cout<<"ans = "<<ans<<"n = "<<n<<endl;

		int size = que.size();

		for(int i = 0; i < size; i++){

			Node node = que.front();

			que.pop();

			int x = node.x, y = node.y;

//			cout<<"x = "<<x<<", y = "<<y<<endl;

			for(int i = 0; i < 4; i++){

				int tx = x + dirs[i][0], ty = y + dirs[i][1];

				if(tx >= 0 && tx < h && ty >= 0 && ty < w && vis[tx][ty] == 0 && mp[tx][ty] == t){

					sx = tx, sy = ty;

					ans++;

					flag = false;

					return;

				}else if(tx >= 0 && tx < h && ty >= 0 && ty < w && vis[tx][ty] == 0 &&  mp[tx][ty] != 'X'){

//					cout<<"tx = "<<tx<<", ty = "<<ty<<endl;

					que.push(Node(tx, ty));

					vis[tx][ty] = 1;

				}

			} 

		}

		ans++;

	}

	if(flag) ans = 0;

}



int main(){

	cin>>h>>w>>n;

	for(int i = 0; i < h; i++){

		scanf(" %s", mp[i]);

	}

	for(int i = 0; i < h; i++){

		for(int j = 0; j < w; j++){

			if(mp[i][j] == 'S'){

				sx = i, sy = j;

			}

		}

	}

	int res = 0;

	for(int i = 1; i <= n; i++){

		bfs(i + '0');

		for(int m = 0; m < h; m++)

			for(int k = 0; k < w; k++)

				vis[m][k] = 0;

		while(!que.empty())que.pop();

		res += ans;

	}

	cout<<res<<endl;

	return 0;

}



/**

331

S..

...

..1

*/