#include<bits/stdc++.h>
using namespace std;
int main ()
{
int n;
cin>>n;
string s;
cin>>s;
int f=0;
for (int i = 0; i < n; i++)
{
if((s[i]=='(' and s[n-1]==')') or (s[i]=='{' and s[n-1]=='}') )
{
f=1;
break;
}
else
f=0;
}
if(f==1)
cout<<"yes";
else
cout<<"no";
}
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