#include<iostream>
using namespace std;
int main(){
int n,m, res=0;
string str;
cin>>n>>m;
for(int i=0;i<n;i++){
cin>>str;
int ok=0;
for(int j=0;j<m;j++){
if(str[j]=='O')
ok++;
}
if(ok>m/2)
res++;
}
cout<<res;
return 0;
}
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