Problem:
Score : 100 points

Problem Statement

We have five variables x_1, x_2, x_3, x_4, and x_5.

The variable x_i was initially assigned a value of i.

Snuke chose one of these variables and assigned it 0.

You are given the values of the five variables after this assignment.

Find out which variable Snuke assigned 0.

Constraints

The values of x_1, x_2, x_3, x_4, and x_5 given as input are a possible outcome of the assignment by Snuke.

Input

Input is given from Standard Input in the following format:

x_1 x_2 x_3 x_4 x_5

Output

If the variable Snuke assigned 0 was x_i, print the integer i.

Sample Input 1

0 2 3 4 5

Sample Output 1

1

In this case, Snuke assigned 0 to x_1, so we should print 1.

Sample Input 2

1 2 0 4 5

Sample Output 2

3

Solution in C++ (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
typedef long long int ll;
#define Y cout<<"YES\n"
#define N cout<<"NO\n"
#define YL cout<<"Yes\n"
#define NL cout<<"No\n"
#define pb push_back
#define cases long long int t;cin>>t;while(t--)
#define fio ios::sync_with_stdio(false); cin.tie(0)
#define foi(a,n) for(ll i=a;i<n;i++)
#define foir(a,n) for(ll i=a;i>=n;i--)
#define foj(a,n) for(ll j=a;j<n;j++)
#define fok(a,n) for(ll k=a;k<n;k++)
#define ALL(v) (v).begin(), (v).end() 
#define twod(n,m) vector<vector<int> > arr( n , vector<int> (m, 0))
#define prs(s,n) for(ll i=0;i<n;i++)cout<<s[i];
#define pra(arr,n) for(ll i=0;i<n;i++)cout<<arr[i]<<" ";
#define err1(a) cout<<#a<<" "<<a<<endl;
#define err2(a,b) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<endl;
#define err3(a,b,c) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<endl;
#define err4(a,b,c,d) cout<<#a<<" "<<a<<" "<<#b<<" "<<b<<" "<<#c<<" "<<c<<" "<<#d<<" "<<d<<endl;
using namespace std;
int main() 
{
	fio;
	int arr[4];
  	foi(0,4)
      cin>>arr[i];
 	foi(0,4)
    {
     if(arr[i]==0) 
     {
       cout<<i+1;
       return 0;
     }
    }
}