Atcoder beginner cp

Problem 1 . Atcoder beginner contest 185

Problem Statement
Takahashi has decided to hold some number of programming contests.Holding one contest requires 
one 100-point problem, one 200-point problem, one 300-point problem, and one 400-point problem.
When he has A1,A2,A3,and A4 drafts of 100-,200-, 300-, and 400-point problems, respectively, at most how many contests can he hold?
The same draft can be used only once.

Constraints
1≤Ai≤100
(1≤i≤4)
All values in input are integers.
Input
Input is given from Standard Input in the following format:

A1 A2 A3 A4

Output
Print an integer representing the maximum number of contests that can be held.

Sample Input 1 
5 3 7 11
Sample Output 1 
3
By using three drafts for each slot, he can hold three contests. He has just three drafts for 
200
-point problems, so he cannot hold four.

Sample Input 2 
100 100 1 100
Sample Output 2 
1
A contest cannot be held even if there is just one missing slot.

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My solution 
#include<iostream>
using namespace std;
int main()
{
long int arr[5];
  for(int i=0;i<4;i++)
  {
  cin>>arr[i];
  }
sort(arr,arr+4);
  cout<<arr[0];
 
 return 0;
 }