ll@N,@K,@A[N],s=0,a;segtree<ll>t;t.malloc(N+1,1);REP(i,N+1)s+=a=i<N?A[i]:0,t.change(i,i+1,(i<K?0:t.getMinVal(i-K,i))+a);wt(s-t[N]);