Scanner sc = new Scanner(System.in);
int size = sc.nextInt();
System.out.println(size+"");
long arr[] = new long[size];
for(int i=0;i<size;i++){
arr[i] = sc.nextLong();
}
Arrays.sort(arr);\
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Smart phine dumb user
long sum = arr[arr.length-1];
for(int i=0;i<arr.length-1;i++){
if((arr[i](arr.length-i))>sum)
sum = arr[i](arr.length-i);
}
System.out.println(sum+“”);