function processData(input) {
    //Enter your code here
    input = input.split('\n')
    var count = input[0];
    var journey = input[1].split('');
    var tracker = 0;
    var valleys = 0;
    var prev;
    
    journey.forEach(function(item, i) {
        if (item === 'U') {
            tracker++;
         
        }
        else if (item === 'D') {
            tracker--;
           
        }
        
        if (tracker === 0 && i !== 0 && prev < 0) valleys++;
        prev = tracker;
    });
    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);
});