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

pair<int,int> xd[500005];
int b[500005];
int main(){
    int n;
    ios_base::sync_with_stdio(0);
    cin>>n;
    long long s=0;
    for(int i=1;i<=n;i++){
        cin>>b[i];
        s+=b[i];
    }
    if(s<0){
        cout<<"-1";
        return 0;
    }
    xd[1].first=b[1];
    for(int i=2;i<=n;i++){
        bool ps=0;
        unsigned long long bw=-1;
        for(int j=1;j<i;j++){
            if(xd[j].second!=-1){
                if(xd[j].first>=0){
                    ps=1;
                    bw=min(bw,(unsigned long long)(xd[j].second));
                }
                xd[j].first+=b[i];
                xd[j].second++;
            }
        }
        if(ps==0){
            xd[i].second=-1;
        }else{
            xd[i].second=bw;
            xd[i].first=b[i];
        }
    }
    unsigned int bww=-1;
    for(int i=1;i<=n;i++){
        if(xd[i].first>=0)bww=min(bww,(unsigned int)xd[i].second);
    }
    cout<<bww;
}