# Enter your code here. Read input from STDIN. Print output to STDOUT

n = gets.to_i
steps = gets.strip.split('')

current_level = 0
mountains = 0
valleys = 0

for i in 0..steps.size-1
    previous = current_level
    if steps[i] == 'U'
        current_level += 1
    else
        current_level -= 1
    end
    
    if current_level == 0
        if previous > 0
            mountains += 1
        end
        if previous < 0
            valleys += 1
        end
    end
end

puts valleys