/in/foo.cc:20:8: error: stray '\343' in program
  cin >>　N;
        ^
/in/foo.cc:20:9: error: stray '\200' in program
  cin >>　N;
         ^
/in/foo.cc:20:10: error: stray '\200' in program
  cin >>　N;
          ^
/in/foo.cc:25:11: error: stray '\343' in program
    cout <<　i;
           ^
/in/foo.cc:25:12: error: stray '\200' in program
    cout <<　i;
            ^
/in/foo.cc:25:13: error: stray '\200' in program
    cout <<　i;
             ^
/in/foo.cc: In function 'int isPrime(int)':
/in/foo.cc:7:6: warning: unused variable 'i' [-Wunused-variable]
  int i;
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:8: warning: unused variable 'i' [-Wunused-variable]
  int N,i;
        ^