#include<iostream> using namespace std; int main() { char str[101] = {0,}; int h,s,i = 0; cin >> h >> s; cin >>str; while(str[i] != '\0') { if(str[i] == 'u' && s > 0) s -= 1; else if(str[i] == 'd' && s < h) s += 1; i++; } cout << s << endl; return 0; }