#include<bits/stdc++.h> using lint=long long; int main(){ std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false); std::cout.setf(std::ios_base::fixed);std::cout.precision(15); lint n;std::cin>>n; std::vector<std::string>a(n); for(auto&&s:a)std::cin>>s; lint N=1l<<n*(n-1)/2; lint ans=n; for(lint bs=0;bs<N;bs++){ std::vector<std::vector<lint>>b(n,std::vector<lint>(n)); for(lint i=0,k=0;i<n;i++){ for(lint j=i+1;j<n;j++,k++){ char c=a.at(i).at(j); b.at(i).at(j)=c=='-'?bs>>i&1:c=='o'; b.at(j).at(i)=!b.at(i).at(j); } } lint win=0; std::vector<lint>ckd(n+1); for(lint i=0;i<n;i++){ lint x=std::accumulate(b.at(i).begin(),b.at(i).end(),0ll); if(i==0)win=x; ckd.at(x)=true; } lint now=std::count(ckd.begin()+win,ckd.end(),true); if(now<ans)ans=now; } std::cout<<ans<<'\n'; }