#!/usr/bin/python3
import fileinput

hx = 0
hy = 0
tx = 0
ty = 0
visit = {(tx, ty)}

for line in fileinput.input():
	dir, dist = line.rstrip().split(' ')
	for i in range(0, int(dist)):
		# Move the head
		if dir == 'R':
			hx += 1
		elif dir == 'L':
			hx -= 1
		elif dir == 'D':
			hy += 1
		elif dir == 'U':
			hy -= 1

		# Now move the tail if necessary
		if (abs(tx - hx) <= 1) and (abs(ty - hy) <= 1):
			pass
		elif tx == hx:
			if ty < hy:
				ty += 1
			else:
				ty -= 1
		elif ty == hy:
			if tx < hx:
				tx += 1
			else:
				tx -= 1
		else:
			# Tail must move diagonally
			if tx < hx:
				tx += 1
			else:
				tx -= 1
			if ty < hy:
				ty += 1
			else:
				ty -= 1

		# Update tail position tracking
		visit.add((tx, ty))

print(len(visit))