preprocess all prime numbers upto 10 ^ 5
sieve ( ) ; cout << phi ( 11 ) << " STRNEWLINE " ; cout << phi ( 21 ) << " STRNEWLINE " ; cout << phi ( 31 ) << " STRNEWLINE " ; cout << phi ( 41 ) << " STRNEWLINE " ; cout << phi ( 51 ) << " STRNEWLINE " ; cout << phi ( 61 ) << " STRNEWLINE " ; cout << phi ( 91 ) << " STRNEWLINE " ; cout << phi ( 101 ) << " STRNEWLINE " ; return 0 ; }