import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		double t = sc.nextInt();
	
		t += 0.5;
		int count = 0;
		int s = 1;

		boolean flag = true;
		while(flag){
			if(a * s < t){
				count++;
				s++;
			}else{
				flag = false;
			}
		}
		System.out.println(count * b);
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz