Noi OJ 1.3 20: power C language for computing 2

describe

Given a nonnegative integer n, seek 2n.

Input

An integer n.0 <= n < 31.

Output

An integer , namely 2 Of n Power .

Because of the demand 2 Of n Power , So here we introduce pow（）, quote pow（） Need to use #include<math.h>.

#include<stdio.h>
#include<math.h>
int main(){
int a;
scanf("%d",&a);
int b=pow(2,a);
printf("%d",b);
return 0;
}

notes ：pow(x,y)  Calculation x Of y The next power .