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- #include <iostream>
- #include <cmath>
- using namespace std;
- double fastmult(double a,int n)
- {
- if (n<0) { a=1.0/a;
- n=-n;
- }
- if (n>=1)
- {
- if (n%2!=0) return a*fastmult(a,n-1);
- else return fastmult(a,n/2)*fastmult(a,n/2);
- }
- else
- return 1;
- }
- int main()
- {
- double a;
- int n;
- cin>>a>>n;
- cout<<fastmult(a,n);
- }
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