function processData(input) {
    // Define Variables
    var inputs = input.split("\n"),
        numSteps = Number(inputs[0]),
        steps = inputs[1].trim(),
        numValleys = 0,
        level = 0;
    // Iterate over the array
    for (var i = 0; i < numSteps; i++){
        if(steps[i] == "U"){
            level += 1;
        }
        else
            if(steps[i] == "D"){
                level -= 1;
                if(level == -1)
                    numValleys += 1;
            }
    }
    // Print answer
    console.log(numValleys);
}

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});