function processData(input) {
    //Enter your code here
    var [n, steps] = input.split('\n');
    n = parseInt(n);
    var level = 0;
    var nextLevel;
    var valleys = 0;
    for (let i = 0; i < n; i++) {
        nextLevel = steps[i] === 'U' ? level+1 : level-1;
        if (level == 0 && nextLevel == -1) {
            // valley start
            valleys++;
        }
        level = nextLevel;
    }
    console.log(valleys);
} 

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

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