commands = "URR"

x = 0
y = 0

for c in commands:
    if c == 'U':
        y += 1
    elif c == 'D':
        y -= 1
    elif c == 'L':
        x -= 1
    elif c == 'R':
        x += 1

distance = abs(x) + abs(y)
print(distance)