package main                                                                                                                                                                                                
                                                                                                                                                                                                              
  import "fmt"                                                                                                                                                                                                
  import "math/big"                                                                                                                                                                                           
                                                                                                                                                                                                              
                                                                                                                                                                                                              
func main() {                                                                                                                                                                                               
      var s string                                                                                                                                                                                            
      fmt.Scanf("%s", &s)                                                                                                                                                                                     
      A := new(big.Int)                                                                                                                                                                                       
      A.SetString(s, 10)                                                                                                                                                                                      
                                                                                                                                                                                                              
      fmt.Scanf("%s", &s)                                                                                                                                                                                     
      s = s[: len(s) - 3] + s[len(s) - 2:]                                                                                                                                                                    
      B := new(big.Int)                                                                                                                                                                                       
      B.SetString(s, 10)                                                                                                                                                                                      
                                                                                                                                                                                                              
      h := big.NewInt(100)                                                                                                                                                                                    
                                                                                                                                                                                                              
      C := new(big.Int)                                                                                                                                                                                       
      C.Mul(A, B)                                                                                                                                                                                             
      C.Div(C, h)                                                                                                                                                                                             
                                                                                                                                                                                                              
      fmt.Printf("%s\n", C.String())                                                                                                                                                                           
  }    

Measured memory_bytes: 1964