#include<bits/stdc++.h>
using namespace std;
int n;
constexpr int N=105;
int x[N],y[N];char c[N];
int main(){
    cin>>n;
    for(int i=1;i<=n;i++) cin>>x[i]>>y[i]>>c[i];
    if(n<3) return cout<<n<<'\n',0;
    for(int i=1;i<=n;i++)
    for(int j=1;j<=n;j++)if(i!=j)
    for(int k=1;k<=n;k++)if(i!=k&&j!=k&&c[i]==c[k]){
        if(1ll*(x[j]-x[i])*(y[k]-y[j])>1ll*(y[j]-y[i])*(x[k]-x[j])){
            cout<<"infinity\n";
            return 0;
        }
    }
    cout<<"2\n";
}