#include using namespace std; typedef long long int ll; #define ft first #define sd second #define pb push_back #define mp make_pair #define pii pair #define vi vector #define pll pair #define vll vector ll MOD=1000000000+7; ll M=100000+10; vector v; pair pr; map mpp; set ts; ll a[100000+10]; int main() { ios::sync_with_stdio(0);cin.tie(0); ll n,count[200]={0},ans=0; cin>>n; for (ll i=0;i>a[i];count[a[i]]++; } for(ll i=0;i<=99;i++) { ans=max(ans,count[i]+count[i+1]); } cout<