def tinhTongBoiSo(n):
	sum = 0;
	for i in range(0,n):
		if (i % 5 == 0 or i % 3 == 0):
			sum = sum + i;

	return sum;

def main():
	result = tinhTongBoiSo(1000);
	print(result);

if __name__ == '__main__':
   main()