#include<cstdio>
void read(),solve(),write();

int n,k,a[16100],L,R,M,c;

int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    read();
    solve();
    write();
    return 0;
}
void read()
{
    int i;
    scanf("%d%d",&n,&k);
    for(i=1;i<=n;i++) scanf("%d",&a[i]);
    L=1; R=256000000;
}
void solve()
{
    int i,s,x;
    while(L<R)
    {
        s=0; x=0;
        M=(L+R)/2;
        for(i=1;i<=n;i++)
        {
            if(s+a[i]<=M) s+=a[i];
            else {x++; s=a[i];}
        }
        x++;
        if(x<=k) {R=M; c=M;}
        else L=M+1;
    }
}
void write()
{
    printf("%d\n",c);
}