Score : $100$ points
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 $0$.
Input is given from Standard Input in the following format:
$x_1$ $x_2$ $x_3$ $x_4$ $x_5$
If the variable Snuke assigned $0$ was $x_i$, print the integer $i$.
0 2 3 4 5
In this case, Snuke assigned $0$ to $x_1$, so we should print $1$.
1 2 0 4 5