#include<iostream> #include<string> using namespace std; int main() { int h,s,x; char a[105]; cin >> h >> s; cin >> a; for(int i = 0;a[i];i++) { if(a[i] == 'u') { if(s == 0) { continue; } s--; } else { if(s == h) continue; s++; } } cout << s; return 0; }