C :

#include<stdio.h>
#include<math.h>
int main()
{
	int year;
	float money,rate,sum;
	sum=0;
	scanf("%f%d%f",&money,&year,&rate);
	sum=money*pow((1+rate),year);
	printf("%.1f\n",sum);
	return 0;
}

C++ :

#include "stdio.h"
#include "math.h"
int main(int argc, char* argv[])
{
	double m,y,r,sum;
	while(~scanf("%lf%lf%lf",&m,&y,&r))
	{
	  sum=m*pow((1+r),y);
	  printf("%.1lf\n",sum);
	}
	return 0;
}