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

#define itn long long
#define rep(i,n) for(int i=0;i<(int)n;++i)
#define rrep(i,n) for(int i=(int)(n);i>=0;--i)
#define debug(x) cout << #x << "=" << (x) << endl;
const ll MOD=1e9+7;

template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return true;}return false;}
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return true;}return false;}
template<typename T> void fail(T v){cout << v << endl;exit(0);}
//template end

void solve(){
  int N;
  cin>>N;
  vector<int> A(N+1);
  int c[1010101];
  rep(i,N){
    cin>>A[i+1];
    A[i+1]+=A[i];
    c[A[i+1]]++;
  }
  int res=0;
  for(int i=1;i<=N;i++){
    int r=1,s=A[i]<<1;
    while(c[s]){r++;s+=A[i];}
    chmax(res,r);
  }
  cout<<res<<endl;
}
 
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(20);
  solve();
  return 0;
}