function processData(input) {
    input = input.split("\n");
    var n = input[0];
    var arr = input[1];
    var count = 0;
    var hike = 0;
    for (var i = 0; i < n; ++i) {
        (arr[i] == 'U')? hike++ : hike --;
        
        if (hike == 0 && arr[i] == 'U') 
            count++;
    }
    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);
});