function processData(input) {
    //Enter your code here
    input = input.split('\n');

    n = input[0];
    steps = input[1];

    var valleys = 0;
    var height = 0;
    var inValley = false;

    for(let c = 0; c < n; c++){
        if(steps[c] === 'U'){
            height++;
        }else{
            height--;
        }

        if(inValley && height == 0) valleys++;

        inValley = (height < 0);
    }

    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);
});