#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>

int main(void)
{
	int n;
	scanf("%i", &n);
	char steps[n];
	scanf("%s", steps);
	int sealvl = 0;
	int counter = 0;
	for( int i = 0; i < n; i++ )
	{
		if( ( sealvl == 0 ) && ( steps[i] == 'D' ) )
		{
			counter++;
		}
		if( steps[i] == 'U' )
		{
			sealvl++;
		}else
		{
			sealvl--;
		}
	}
	printf("%i\n", counter);
	return 0; 
}