#include using namespace std; #define ALL(x) begin(x),end(x) #define rep(i,n) for(int i=0;i<(n);i++) #define debug(v) cout<<#v<<":";for(auto x:v){cout<bool chmax(T &a,const T &b){if(abool chmin(T &a,const T &b){if(b ostream &operator<<(ostream &os,const vector&v){ for(int i=0;i<(int)v.size();i++) os< istream &operator>>(istream &is,vector&v){ for(T &x:v)is>>x; return is; } signed main(){ int n;cin>>n; vector a(n); cin>>a; sort(ALL(a)); rep(i,n) a[i]-=i; map cnt; rep(i,n) cnt[a[i]]++; int res=1; for(auto [u,v]:cnt) chmax(res,v); cout<