Competitions
Биномиальный коэффициент
C0n + ... + Cnn
Given a non-negative integer n, find the sum of binomial coefficients
Input
One non-negative integer n (n ≤ 60).
Output
Print the value of the sum.
Input example #1
2
Output example #1
4
Given a non-negative integer n, find the sum of binomial coefficients
One non-negative integer n (n ≤ 60).
Print the value of the sum.
2
4