#include <stdio.h>

int main(void)
{
	// 3.0e-23 grams
	float molecule_weight = 3.0e-23;
	// a quart is about 950 grams
	float gram_per_quart = 950;
	float quarts, grams;

	printf("Input the amount of water in quarts: ");
	scanf("%f", &quarts);
	grams = quarts * gram_per_quart;
	printf("These are %.2f grams of water ", grams);
	printf("and contain about %e molecules", grams / molecule_weight);
	return 0;
}