#include <bits/stdc++.h>
using namespace std;

int equalzeroandone(vector<int>v){
    int n=v.size();
    for(int i=0;i<n;i++){
        if(v[i]==0){
            v[i]=-1;
        }
    }
    int sum=0;
    int ans=-1;
   map<int,int>mp;
    for(int i=0;i<n;i++){
        sum+=v[i];
        if(sum==0){
            ans=i+1;
        }
        if(mp.find(sum)!=mp.end()){
            ans=max(ans,i-mp[sum]);
        }
        else{
            mp[sum]=i;
        }
    }
    return ans;
}

int main() {
    int n;
    cin>>n;
    vector<int>v(n);
    for(int i=0;i<n;i++){
        cin>>v[i];
    }
    cout<<equalzeroandone(v);
}

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