#include

include

using namespace std; int main() { int n; cin>>n; int j , i = 0, cnt = 0;

        string s;
        cin>>s;

for(j = 0; j < n; j++) { if(s[j] == 'U') { i = i + 1; if(i == 0) cnt++; } else if(s[j] == 'D') { i = i - 1; } }

        cout<<cnt<<endl;

return 0; }