#include <iostream>
#include <stdio.h>

int main() {
	double cost, infl;
	int years,i;
	char buffer[50];

	std::cout << "Current cost of a pencil: ";
	std::cin >> cost;

	std::cout << "Inflation percentage: ";
	std::cin >> infl;
	infl /= 100;
	
	std::cout << "Years to calculate: ";
	std::cin >> years;

	for (i = 1; i <= years; i++) {
		cost += (infl * cost);
	}

	sprintf(buffer,"%.2f",cost);
	std::cout << "Cost of one pencil in " << years << " years will be: $" << buffer << "\n";
}