code

#include <stdio.h>

int main()
{
    double x;
    int n;
    scanf("%lf %d",&x,&n);
    double sum=0;
    for (int i = 0; i <= n;i++){
        double sum1 = 1.0;
        for (int j = 1; j<=i;j++){
            sum1 *= x;
        }
        sum += sum1;
    }

    printf("%.2lf", sum);

    return 0;
}