// Enter your code here 
let numOfSteps = Int(readLine()!)!
let steps = readLine()!

let seaLevel = 0
var currentLevel = seaLevel
var isCurrentlyInValley = false
var amountOfValleysWalked = 0

for step in steps.characters {
    if step == "U" {
        currentLevel += 1
    } else {
        currentLevel -= 1
    }
    
    if (currentLevel == seaLevel) && isCurrentlyInValley {
        isCurrentlyInValley = false
        amountOfValleysWalked += 1
    } else if (currentLevel < seaLevel) && !isCurrentlyInValley {
        isCurrentlyInValley = true
    }
}

print(amountOfValleysWalked)