#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv){
	double bore = 86.5;
	double stroke = 86.5;
	double displacement = 0;
	double pi = 3.14159;
	double cylinders = 8;
	double mmtoin = 0.0000610237438368;
	double tmp = 0;

	tmp = bore/2;
	displacement = tmp * tmp * pi * stroke * cylinders;

	printf("displacement: %lf\n", displacement/1000);

	return 0;
}