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

#include<cstring>

#include<iostream>

#include<queue>

#include<vector>

#include<algorithm>

#include<string>

#include<cmath>

#include<set>

#include<map>

#include<vector>

#include<stack>

#include<utility>

#include<sstream>

using namespace std;

typedef long long ll;

const int inf = 0x3f3f3f3f;

const int maxn = 1005;

int a[1005][1005];

int x[20], y[20];

int ans, w, h, n;

bool leap[1005][1005];

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

struct Node

{

	int x, y, t;

	Node(int x, int y, int t) :x(x), y(y), t(t){}

};

int work(int xx, int yy, int pos)

{

	memset(leap, false, sizeof(leap));

	leap[xx][yy] = 1;

	queue<Node>p;

	p.push(Node(xx, yy, 0));

	while (p.size())

	{

		Node temp = p.front();

		p.pop();

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

		{

			int tempx = temp.x + dir[i][0];

			int tempy = temp.y + dir[i][1];

			if (tempx >= 1 && tempx <= h&&tempy >= 1 && tempy <= w)

			{

				if (a[tempx][tempy] == 1)continue;

				if (leap[tempx][tempy] == 1)continue;

				if (tempx == x[pos + 1] && tempy == y[pos + 1])

				{

					return temp.t + 1;

				}

				leap[tempx][tempy] = 1;

				p.push(Node(tempx, tempy, temp.t + 1));

			}

		}

	}



}

int main()

{

#ifdef LOCAL

	freopen("C:\\Users\\ΡΡ\\Desktop\\in.txt", "r", stdin);

	//freopen("C:\\Users\\ΡΡ\\Desktop\\out.txt","w",stdout);

#endif // LOCAL

	while (scanf("%d%d%d", &h, &w, &n) != EOF)

	{

		char s[1005];

		for (int i = 1; i <= h; i++)

		{

			scanf("%s", s);

			for (int j = 1; j <= w; j++)

			{

				if (s[j - 1] == '.')

					a[i][j] = 0;

				else if (s[j - 1] == 'X')

					a[i][j] = 1;

				else if (s[j - 1] == 'S')

				{

					x[0] = i; y[0] = j;

					a[i][j] = 0;

				}

				else

				{

					a[i][j] = 0;

					int id = s[j - 1] - '0';

					x[id] = i; y[id] = j;

				}

			}

		}

		ans = 0;

		for (int i = 0; i < n; i++)

		{

			ans = ans + work(x[i], y[i], i);

		}

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

	}

	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 1.9914014285106691x):
#include <iostream>

#include <cstdio>

#include <queue>

#include <algorithm>

#include <cstring>

#include <string>

#include <stack>

#include <stdlib.h>

#include <cctype>

#include <vector>

#include <map>

#include <set>

#include <cmath>

#include <iomanip>

using namespace std;

const int INF=1000000000;

const int max_n=1005;

typedef pair<int,int>P;

char maze[max_n][max_n+1];

int n,m,sx,sy;

int d[max_n][max_n];

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

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

int bfs(char e)

{

    queue<P>que;

    for(int i=0;i<n;i++)

        for(int j=0;j<m;j++)d[i][j]=INF;

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

    d[sx][sy]=0;

    while(!que.empty())

    {

        P q=que.front();

        que.pop();

        if(maze[q.first][q.second]==e){sx=q.first;sy=q.second;break;}

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

        {

            int nx=q.first+dx[i],ny=q.second+dy[i];

            if(0<=nx&&nx<n&&ny>=0&&ny<m&&maze[nx][ny]!='X'&&d[nx][ny]==INF)

            {

                que.push(P(nx,ny));

                d[nx][ny]=d[q.first][q.second]+1;

            }

        }

    }

return d[sx][sy];

}

int main()

{

    int t;

    while(cin>>n>>m>>t)

    {

       for(int i=0;i<n;i++)

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

       {

           cin>>maze[i][j];

           if(maze[i][j]=='S')sx=i,sy=j;

       }



       int res=0;

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

        res+=bfs(i+'0');

       }

        cout<<res<<endl;

    }

    return 0;

}