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

#include<cstring>

#include<queue>

#define maxn 1002

#define maxc 10

using namespace std;

struct point{

    int r,c;

};

char graph[maxn][maxn];

int len[maxn][maxn];

bool mark[maxn][maxn];

point node[maxc];

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

int main(void){

    int h,w,cheese,tr,tc,answer=0;

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

    memset(graph,0,sizeof(graph));

    memset(node,0,sizeof(node));

    for(int i=1;i<=h;i++) for(int j=1;j<=w;j++){

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

        while(graph[i][j]==' ' || graph[i][j]=='\n');

        if(graph[i][j]>='0' && graph[i][j]<='9'){

            node[graph[i][j]-'0'].r=i;

            node[graph[i][j]-'0'].c=j;

        }

        else if(graph[i][j]=='S'){

            node[0].r=i;

            node[0].c=j;

        }

    }

    for(int cnt=0;cnt<cheese;cnt++){

        memset(len,0,sizeof(len));

        memset(mark,false,sizeof(mark));

        for(int i=0;i<=h+1;i++){mark[i][0]=true;mark[i][w+1]=true;}

        for(int j=0;j<=w+1;j++){mark[0][j]=true;mark[h+1][j]=true;}

        queue<point> q;

        q.push(node[cnt]);

        len[node[cnt].r][node[cnt].c]=0;

        point ongo,togo;

        while(!q.empty()){

            ongo=q.front();

            q.pop();

            if(mark[ongo.r][ongo.c]) continue;

            mark[ongo.r][ongo.c]=true;

            if(ongo.r==node[cnt+1].r && ongo.c==node[cnt+1].c){

                answer+=len[ongo.r][ongo.c];

                break;

            }

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

                togo.r=ongo.r+dir[i][0];togo.c=ongo.c+dir[i][1];

                if(mark[togo.r][togo.c]==false && graph[togo.r][togo.c]!='X'){

                    len[togo.r][togo.c]=len[ongo.r][ongo.c]+1;

                    q.push(togo);

                }

            }

        }

    }

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

    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.3697540748197732x):
#include "cstring"

#include "cstdio"

#include "queue"

using namespace std;



const int maxn=1024;



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

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



char mp[maxn][maxn];

int vis[maxn][maxn];

int wx[10],wy[10];

int n,m,k;



int bfs(int x1,int y1,int x2,int y2)

{

	memset(vis,0,sizeof(vis));

	queue<int>qx;qx.push(x1);

	queue<int>qy;qy.push(y1);

	queue<int>qt;qt.push(0);

	vis[x1][y1]=1;

	

	while(!qx.empty())

	{

		int nx=qx.front();qx.pop();

		int ny=qy.front();qy.pop();

		int nt=qt.front();qt.pop();

		

		if(nx==x2 && ny==y2)return nt;

		

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

		{

			int px=nx+dx[i];

			int py=ny+dy[i];

			if(px>=0 && py>=0 && px<n && py<m && mp[px][py]!='X' && !vis[px][py])

			{

				qx.push(px);

				qy.push(py);

				qt.push(nt+1);

				vis[px][py]=1;

			}

		}

		

	}

	

	return 0;

}



int main()

{

	//freopen("f.txt","r",stdin);

	scanf("%d%d%d",&n,&m,&k);

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

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

		{

			mp[i][j]=getchar();

			while(mp[i][j]=='\n' || mp[i][j]=='\0')mp[i][j]=getchar();

			if(mp[i][j]>='1' && mp[i][j]<='9')

			{

				wx[mp[i][j]-'0']=i;

				wy[mp[i][j]-'0']=j;

			}

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

			{

				wx[0]=i;

				wy[0]=j;

			}	

		}

	int ans=0;

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

		ans+=bfs(wx[i],wy[i],wx[i+1],wy[i+1]);

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

	return 0;

}