# include<stdio.h> # include<iostream> # include<string> using namespace std; int main(){ int h,s; string z; int len=z.size(); cin>>h>>s>>z; for(int i=1;i<=len;i++){ if(z[i]=='u'){ if(s>0){ s=s+1; } } if(z[i]=='d'){ if(s<h){ s=s-1; } } } cout<<s; return 0; }