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

#include<queue>

#include<cctype>





using namespace std;



int cnt;

char field[1002][1002];

int cost[1002][1002];

int factory[9][2];

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

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



int bfs(int sx, int sy, int gx, int gy) {

    queue< pair<int,int> > que;



    for(int i = 0; i < 1002; i++) {

        for (int j = 0; j < 1002; j++) {

            cost[i][j] = -1;

        }

    }



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

    cost[sx][sy] = 0;



    while(!que.empty()) {

        pair<int, int> p;

        p = que.front();

        que.pop();

        

        if(p.first == gx && p.second == gy) {

            break;

        }



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

            int tx = p.first + x[i]; int ty = p.second + y[i];

            if(field[tx][ty] != 'X' && cost[tx][ty] == -1) {

                que.push(pair<int, int>(tx, ty));

                cost[tx][ty] = cost[p.first][p.second] + 1;

            }

        }

    }

    return cost[gx][gy];

}



int main() {

    int w, h, n, sx, sy;



    cin >> h >> w >> n;



    for (int y = 1; y <= h; y++) {

        for (int x = 1; x <= w; x++) {

            cin >> field[x][y];

            if (field[x][y] == 'S') {

                sx = x;

                sy = y;

            } else if(isdigit(field[x][y])) {

                int tmp = field[x][y] - '0';

                factory[tmp][0] = x;

                factory[tmp][1] = y;

            }

        }

        field[0][y] = 'X';

        field[w + 1][y] = 'X';

    }



    for (int x = 0; x <= w + 1; x++) {

        field[x][0] = 'X';

        field[x][h + 1] = 'X';

    }



    int cnt = 0;

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

        // 次の目的地へ行くで

        cnt += bfs(sx, sy, factory[i][0], factory[i][1]);

        sx = factory[i][0];

        sy = factory[i][1];

    }



    cout << cnt << endl;

}

// Faster C++ solution for the same problem (measured speedup: 2.635784441484575x):
#include <cstdio>

#include <cstring>

#include <algorithm>

#include <cmath>

#include <climits>

#include <queue>

using namespace std;

const int N=1000;

char maze[N][N];

int h,w,n;

int sx,sy,gx,gy;

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

int d[N][N];

const int INF=INT_MAX;

int ans;

struct node

{

    node(int xx=0,int yy=0,int tt=0,char ss=0):x(xx),y(yy),t(tt),s(ss){}

    int x;

    int y;

    int t;

    char s;

};

bool read()

{

    memset(maze,0,sizeof(maze));

    scanf("%d%d%d",&h,&w,&n);

    getchar();

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

    {

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

        {

            scanf("%c",&maze[i][j]);

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

            if(maze[i][j]=='0'+n) gy=i,gx=j;

        }

        getchar();

    }

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

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

    return 1;

}

void show()

{

    //printf("h:%d w:%d\n",h,w);

    //printf("maze[%d][%d]=%d\n",0,2,maze[0][2]);

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

    {

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

        {

            if(d[i][j]!=INF) printf("%d ",d[i][j]);

            else printf("- ");

        }

        printf("\n");

    }

    //printf("sy:%d sx:%d\n",sy,sx);

}

void init(int h,int w)

{

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

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

}

int bfs()

{

   queue<node> que;

   que.push(node(sx,sy,0,'1'));

   d[sy][sx]=0;

   while(!que.empty())

   {



       node t=que.front();que.pop();

       //printf("%c\n",t.s);

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

       {

           int nx=t.x+dir[i][0];

           int ny=t.y+dir[i][1];

           if(0<=nx&&nx<w&&0<=ny&&ny<h&&d[ny][nx]==INF&&maze[ny][nx]!='X'/*(maze[ny][nx]=='.'||maze[ny][nx]==t.s)*/)

           {

               if(maze[ny][nx]=='0'+n&&maze[ny][nx]==t.s)

               {

                   //printf("%c in return",maze[ny][nx]);

                   return ans+=d[t.y][t.x]+1;

               }

               if(maze[ny][nx]==t.s)

               {

                   //printf("%c d\n",maze[ny][nx]);

                   maze[ny][nx]='.';

                    d[ny][nx]=d[t.y][t.x]+1;

                    ans+=d[ny][nx];

                    //show();

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

                    init(h,w);

                    d[ny][nx]=0;

                   que.push(node(nx,ny,0,t.s+1));

                   break;

               }

               else

               {

                   que.push(node(nx,ny,0,t.s));

                    d[ny][nx]=d[t.y][t.x]+1;

               }

           }

       }

       //int size=que.size();

        //printf("size:%d\n",size);

   }

   return 1/*d[gy][gx]*/;

}

int main()

{

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

    {

        getchar();

        memset(maze,0,sizeof(maze));

        ans=0;

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

        {

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

            {

                scanf("%c",&maze[i][j]);

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

                if(maze[i][j]=='0'+n) gy=i,gx=j;

            }

            getchar();

        }

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

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

        bfs();

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

    }

    return 0;

}