static long f ( long x , long y , long m ) {
  long oy = y ;
  long t = 0 ;
  long c = x ;
  long s = 1 ;
  while ( y > 0 ) {
    if ( y % 2 == 1 ) {
      t = ( t + s ) % m ;
      s = s * ( ( c + c * c ) % m ) % m ;
    }
    else s = s * ( 1 + c ) % m ;
    c = c * c % m ;
    y /= 2 ;
  }
  return t ;
}

static long f ( long x , long y , long m ) { long oy = y ; long t = 0 ; long c = x ; long s = 1 ; while ( y > 0 ) { if ( y % 2 == 1 ) { t = ( t + s ) % m ; s = s * ( ( c + c * c ) % m ) % m ; } else s = s * ( 1 + c ) % m ; c = c * c % m ; y /= 2 ; } return t ; }
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