#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
int main()
{
long unsigned int i,n;
scanf("%lu",&n);
char arr[n];
scanf("%s",arr);
long unsigned int newarr[n+1];
newarr[0]=0;
int height=0;
for(i=0;i<n;i++)
{
	if(arr[i]=='U')
	height++;
	else
	height--;
	newarr[i+1]=height;
}
int count=0;
for(i=0;i<=n;i++)
{
	if(newarr[i]==0 && newarr[i+1]==-1)
	count++;
}
printf("%d",count);
	return 0;
}