#include using namespace std; typedef signed long long ll; #undef _P #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- int N,K; ll A[101010]; ll S[203030]; ll nex[201010][22]; ll nex2[101010]; int ok(ll v) { if(S[N]/K>N>>K; FOR(i,N) cin>>A[i]; FOR(i,2*N) S[i+1]=S[i]+A[i%N]; S[2*N+1]=1LL<<60; ll ret=0; for(i=50;i>=0;i--) if(ok(ret+(1LL<