function processData(input) {
    var inputs = (input.split("\n"));
    var n = parseInt(inputs[0]);
    var mountain = inputs[1];
    var count = 0;
    var down = false;
    var sea_level = 0;
    for (var i=0; i<n; i++) {
        if (mountain[i] == "D") {
            if (sea_level == 0) {
                down = true;
            }
            sea_level -= 1;
        }
        if (mountain[i] == "U") {
            sea_level += 1;
            if (sea_level == 0) {
                count += 1;
                down = false;
            }
        }
    }
    console.log(count);
} 

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

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