foo.cc: In function 'int main()':
foo.cc:30:42: warning: statement has no effect [-Wunused-value]
   30 |                                         n+2;
      |                                         ~^~
foo.cc:8:23: warning: variable 'b' set but not used [-Wunused-but-set-variable]
    8 |         int x,i=1,g,s,b,q,n=1,newn;cin>>x;
      |                       ^
foo.cc:8:25: warning: variable 'q' set but not used [-Wunused-but-set-variable]
    8 |         int x,i=1,g,s,b,q,n=1,newn;cin>>x;
      |                         ^

[Hydro](https://hydro.ac)提供评测服务