/in/foo.cc: In function 'int main()':
/in/foo.cc:9:6: warning: statement has no effect [-Wunused-value]
     z==0;
     ~^~~
/in/foo.cc:14:6: warning: statement has no effect [-Wunused-value]
     z==7;
     ~^~~
/in/foo.cc:19:6: warning: statement has no effect [-Wunused-value]
     z==6275;
     ~^~~~~~
/in/foo.cc:24:6: warning: statement has no effect [-Wunused-value]
     z==31108;
     ~^~~~~~~
/in/foo.cc:29:6: warning: statement has no effect [-Wunused-value]
     z==3316;
     ~^~~~~~
/in/foo.cc:5:12: warning: unused variable 's' [-Wunused-variable]
  int n,p,k,s=0,z=0;
            ^