Hiking ⛰ 

function processData(input) {
    

    let string = input.split('\n');
    let n = string[0];
    let arr = string[1].split("");
    let flag  = 0 ;
    let down  = 0 ;
    let res =0 ;
    arr.forEach((a) =>{
       
        if(a == 'U'){
            flag++;
        }else{
            flag--;
        }
        if(flag < 0) down =1
        if(flag ==0 && down == 1)  res++, down = 0
    } );
    

    console.log(res)
   
}


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

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