#!/usr/bin/env python3
import numpy as np

lines = (x.strip() for x in open("input.txt"))
positions = set()
LEN = 2
rope = [np.array((0, 0)) for i in range(LEN)]
dirs = {
    "U": np.array((1, 0)),
    "D": np.array((-1, 0)),
    "L": np.array((0, -1)),
    "R": np.array((0, 1)),
}

for line in lines:
    d, i = line.split(" ")
    d, i = dirs[d], int(i)
    for _ in range(i):
        rope[0] += d
        for p in range(1, 2):
            diff = rope[p-1]-rope[p]
            rope[p] += np.sign(diff) if sum(np.abs(diff)) > 2 else np.sign(diff-np.sign(diff))
        positions.add(tuple(rope[len(rope)-1]))

print(len(positions))