(* Enter your code here. Read input from STDIN. Print output to STDOUT *)
uses math;
const fi='';
fo='';
var f:text;
    res,n,i,j,right,left:longint;
    c:char;
    a:array[0..1000001]of longint;
    //b:array[0..100001] of char;
begin
    assign(f,fi);
    reset(f);
    res:=0;
           readln(f,n);
           a[0]:=0;
           a[n+1]:=0;
           for i:=1 to n do
            begin
                 read(f,c);
                 if c='U' then a[i]:=a[i-1]+1;
                 if c='D'then a[i]:=a[i-1]-1;
            end;
    close(f);
    left:=0;
    right:=0;
    { for i:=1 to n-1 do
       for j:=1+i to n do
        if (a[i] = -1) and (a[i-1]=0) then
        if (a[j] = -1)  and ( a[j+1] =0 ) then inc(res);
     }
     for i:=1 to n-1 do
     begin
         if (a[i-1]= 0) and (a[i] = -1) then inc(left);
         if (a[i]=-1 )  and (a[i+1]=0) then inc(right);
     end;
    assign(f,fo);
    rewrite(f);
       res:=math.min(left,right);
            writeln(f,res);
    close(f);
end.