#include<iostream> #include<string> using namespace std; int main() { int h,s,x; char a[105]; x = strlen(a); cin >> h >> s; cin >> a; for(int i = 1;i <= x;i++) { if(a[i] == 'd' && s > 0) s--; if(a[i] == 'u' && s < h) s++; } cout << s; return 0; }