#include<bits/stdc++.h>
using namespace std;
#define int long long
int l,k;
const int M=2e6;
int a[M];
int minn=-1,max1=-1;
int check(int x)
{
    int sum=0,ans=0;
    for(int i=0;i<l;i++)
    {
        sum+=a[i];
        if(sum<0) sum=0;
        if(sum>=x) {
            sum =0;
            ans++;
        }
    }
    return ans;
}
signed main()
{
    ios::sync_with_stdio(0);
    cin>>l>>k;
    for(int i=0;i<l;i++)
    {
        cin>>a[i];
    }
    int ll=1,rr=1E18;
    while(ll<=rr)
    {
        int mid=(ll+rr)>>1;
        //cout<<mid;
        if(check(mid)<=k)
        {
            rr=mid-1;
            if(check(mid )==k)
                minn=mid;
        }
        else
        {
            ll=mid+1;
        }
    }
    ll=1,rr=1e18;
    while(ll<=rr)
    {
        int mid=(ll+rr)>>1;
        if(check(mid)>=k)
        {
            ll=mid+1;
            if(check(mid )==k)
                max1=mid;
        }
        else
        {
            rr=mid-1;
        }
    }
    if(minn==-1)
    {
        cout<<"-1";
        return 0;
    }
    cout<<minn<<ends<<max1;
}