function processData(input) {
    var arr = input.split('\n');
    var path = arr[1].split('');
    var height = 0;
    var valleys = 0;
    var cur = 0;
    for(var i = 0; i < path.length; i++) {
        path[i] === 'U' ? cur = 1 : cur = -1;  
        if(height < 0 ){
            if( cur + height === 0) {
                valleys++;
            } 
        } 
        height += cur;
    }
    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);
});