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: Accepted)

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
const int dx[] = { -1 , -1 , -1 , 0 , 0 , 0 , 1 , 1 , 1 };
const int dy[] = { -1 , 0 , 1 , -1 , 0 , 1 , -1 , 0 , 1 };
#define N 8010000
#define TC int t;cin>>t;for(int T=1;T<=t;T++)
#define mod 1000000007
#define PI acos(-1)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
void AIA() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); }
bool isprim(int x){
	for(int j=2;j*j<=x;j++){
		if(x%j==0){
			return 0;
		}
	}
	return (x!=1);
}

//cout<<fixed<<setprecision(20);
// freopen("stand.in","r",stdin);
// freopen("stand.out","w",stdout);

/*
 _____________              __                ___        ___       __________________________     ____        ____
|             |            /\ \              |   |      |   |     |                          |    \   \      /   /
|   __________|           / /\ \             |   |      |   |     |     _____      _____     |     \   \    /   /
|  |                     / /  \ \            |   |      |   |     |    |     |    |     |    |      \   \  /   /
|  |                    / /    \ \           |   |      |   |     |    |     |    |     |    |       \   \/   /
|  |______             / /      \ \          |   |______|   |     |    |     |    |     |    |        \      /
|         |           / /        \ \         |              |     |    |     |    |     |    |         \    /
|   ______|          / /          \ \        |    ______    |     |    |     |    |     |    |          |  |
|  |                / /============\ \       |   |      |   |     |    |     |    |     |    |          |  |
|  |               / /==============\ \      |   |      |   |     |    |     |    |     |    |          |  |
|  |              / /                \ \     |   |      |   |     |    |     |    |     |    |          |  |
|  |             / /                  \ \    |   |      |   |     |    |     |    |     |    |          |  |
|__|            /_/                    \_\   |___|      |___|     |____|     |____|     |____|          |__|

							<<<<<<<<<<< NEVER GIVE UP !! >>>>>>>>>>>
							<<<<<<<< YOU CAN DO IT IF YOU WANT !! >>>>>>>>
							<<<<<<<<< BELIEVE IN YOURSELF !! >>>>>>>>>

*/

int main()
{
	//cout<<fixed<<setprecision(20);
	//freopen("stand.in","r",stdin);
	//freopen("stand.out","w",stdout);
	AIA();
	int arr[5];
	for(int i=0;i<5;i++){
		cin>>arr[i];
		if(arr[i]==0){
			cout<<i+1;
			break;
		}
	}
	return 0;
}