#include using namespace std; int freq[200]; int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ memset(freq,0,sizeof(freq)); int n,x; cin>>n; while(n--) { cin>>x; freq[x]++; } int maxi=0; for(int i=1;i<=100;i++) maxi = max(maxi,freq[i]+freq[i-1]); cout<