# include<stdio.h> # include<iostream> # include<string> using namespace std; int main(){ int h,s; string str; cin>>h>>s>>str; for(int i=0;i<str.size();i++){ if(str[i]=='u'){ if(s>0){ s--; } }else{ if(s<h) s++; } } cout<<s; return 0; }