#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
#define per(i,a,b) for(int i=(a);i>=(b);--i)
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define pb push_back
#define ALL(x) x.begin(),x.end()
#define ll long long
using namespace std;
inline ll read(){
    ll x=0,f=1;char ch=getchar();
    while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}
    while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
    return x*f;
}
const int N=3e3+5;
int n,m,ans,mx,r,c;
char s[N][N];
int main(){
    n=read(),m=read();
    rep(i,1,n)scanf("%s",s[i]+1);
    rep(t,2,n+m){
        int x=min(t-1,n),y=t-x;
        mx=r=c=0;
        while(x&&y<=m){
            int now=mx;
            mx=max(mx,max(r,c));
            if(s[x][y-1]=='R'&&s[x][y]=='G'&&s[x][y+1]=='W')
                r=max(now,r)+1;
            if(s[x-1][y]=='R'&&s[x][y]=='G'&&s[x+1][y]=='W')
                c=max(now,c)+1;
            x--,y++;
        }
        ans+=max(mx,max(r,c));
    }
    printf("%d\n",ans);
    return 0;
}