#include<cstdio>
#include<iostream>
#define int long long
using namespace std;
int n,cnt=1,trie[2005][2];
const int mod=1e9+7;
signed main(){
    freopen("lowtea.in","r",stdin);
    freopen("lowtea.out","w",stdout);
    scanf("%lld",&n);
    for(int i=1;i<=n;i++){
        string s;
        cin>>s;
        int p=1;
        for(int j=0;j<s.size();j++){
            if(!trie[p][s[j]-'0'])trie[p][s[j]-'0']=++cnt;
            p=trie[p][s[j]-'0'];
        }
    }
    printf("%lld",cnt);
    return 0;
}