#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;
char a[6107][6107];
int DP[6107][2];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n,m;
cin>>n>>m;
for(int i=4;i<=n+3;i++) for(int j=4;j<=m+3;j++) cin>>a[i][j];
int ans=0;
for(int i=1;i<=n+m+6;i++)
{
memset(DP,0,sizeof DP);
for(int c=1;c<=i+3;c++)
{
int x=c,y=i-c+1;
// cout<<x<<" "<<y<<endl;
DP[c+1][0]=max(DP[c+1][0],DP[c][0]);
DP[c+1][1]=max(DP[c+1][1],DP[c][1]);
if(y-2>0&&a[x+2][y-2]=='R'&&a[x+2][y-1]=='G'&&a[x+2][y]=='W')
{
DP[c+1][0]=max(DP[c+1][0],DP[c][0]+1);
DP[c+3][1]=max(DP[c+3][1],DP[c][0]+1);
}
if(a[x][y]=='R'&&a[x+1][y]=='G'&&a[x+2][y]=='W')
{
DP[c+1][1]=max(DP[c+1][1],DP[c][1]+1);
DP[c+3][0]=max(DP[c+3][0],DP[c][1]+1);
}
// cout<<DP[c][0]<<" "<<DP[c][1]<<endl;
}
ans+=max(DP[i+3][0],DP[i+3][1]);
//cout<<max(DP[i+3][0],DP[i+3][1])<<endl;
}
cout<<ans;
return 0;
}
