#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=int(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
#define rAll(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;
 
int main(){
    int H,W;cin>>H>>W;
    vector<string> s(H);
    REP(i,H) cin>>s[i];
    const int inf=1e9;
    vector<vector<int>> dp(H,vector<int>(W,inf));
    dp[0][0]=0;
    REP(i,H) REP(j,W){
        int pl=1;
        if(s[i][j]!='.') pl+=i+j;
        if(i>0) dp[i][j]=min(dp[i][j],dp[i-1][j]+pl);
        if(j>0) dp[i][j]=min(dp[i][j],dp[i][j-1]+pl);
    }
    cout<<dp[H-1][W-1]<<endl;
}