2853: ABC170A - Five Variables

Memory Limit:128 MB Time Limit:1.000 S
Judge Style:Text Compare Creator:
Submit:1 Solved:1

Description

Time Limit: 2 sec / Memory Limit: 1024 MB

Problem Statement
We have five variables x1,x2,x3,x4and x5.
The variable xi 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.

Input

Input is given from Standard Input in the following format:

x1 x2 x3 x4 x5

Output

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

Sample Input Copy

0 2 3 4 5

Sample Output Copy

1