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#include <cstdio>
using namespace std;
int v[20005],n,k;
bool ok(int nn){
int tr=0,s=0;
bool flag=false;
for(int i=1;i<=n;i++){
if(v[i]>nn){
return 0;
}
if(s+v[i]<=nn){
s+=v[i];
}else{
s=v[i];
tr++;
if(i==1){
flag=true;
}
}
}
if(!flag){
tr++;
}
if(tr<=k){
return 1;
}else{
return 0;
}
}
int bs(int st,int dr){
int med,last=-1;
while(st<=dr){
med=st+(dr-st)/2;
if(ok(med)){
last=med;
dr=med-1;
}else{
st=med+1;
}
}
return last;
}
int main(){
freopen("transport.in","r",stdin);
freopen("transport.out","w",stdout);
int s=0;
scanf("%d%d",&n,&k);
for(int i=1;i<=n;i++){
scanf("%d",&v[i]);
s+=v[i];
}
printf("%d",bs(1,s));
return 0;
}