#include <stdio.h>

int main (){
	float A,B,C,week;
	scanf("%f",&A);
	scanf("%f",&B);
	scanf("%f",&C);
	
	if(C == 0){
		printf("0");
	}else{
	    week = A / B;
	    A = week * C;
	    printf("%f",A);
	}
	return 0;
}