enum Step: Int {
  case up = 1
  case down = -1
}

let numSteps = Int(readLine()!)!

let steps = readLine()!.characters.map({ $0 == "U" ? Step.up : Step.down })

var elevation = 0
var valleys = 0

for step in steps {
  if step == Step.down && elevation == 0{
    valleys += 1
  }
  elevation += step.rawValue
}

print(valleys)