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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("transport.in");
ofstream fout ("transport.out");
int n,k;
int v[16005];
int transporturi(int C)
{
int x=0,j,t=0;
for(j=1;j<=n;j++){
x+=v[j];
if(x>C){
t++;
x=v[j];
}
}
t++;
return t;
}
int main()
{
fin>>n>>k;
int st=-1,dr=0,m,trans,sol,i;
for(i=1; i<=n; i++)
{
fin>>v[i];
dr+=v[i];
st=max(st,v[i]);
}
while(st<=dr){
m=(st+dr)/2;
trans=transporturi(m);
if(trans>k){
st=m+1;
}
else{
sol=m;
dr=m-1;
}
}
fout<<sol;
return 0;
}