#include <string>
#include <iostream>
#include <fstream>

using namespace std;

struct element
{ int atno;
  string symbol, name;
  double atwt; };


void print(element e)
{ cout << "symbol = " << e.symbol <<
          ", name = " << e.name <<
          ", atno = " << e.atno <<
          ", atwt = " << e.atwt << "\n"; }



int read_file(element A[], int maxsize)
{ A[0].symbol = "*";
  A[0].name = "Error";

  ifstream in;
  in.open("elements.txt");
  if (in.fail())
  { cout << "Could not open the file\n";
    exit(1); }

  int maxatno;
  for (int i = 1; i < maxsize; i += 1)
  { element E;
    in >> E.symbol >> E.name >> E.atwt;
    if (in.fail())
      break;
    E.atno = i;
    A[i] = E;
    maxatno = i; }

  in.close();
  return maxatno; }



element find_element(string wanted, element A[], int max)
{ for (int i = 1; i <= max; i += 1)
    if (A[i].symbol == wanted)
      return A[i];
  return A[0]; }



bool looks_like_a_number(string s)
{ for (int i = 0; i < s.length(); i += 1)
  { char c = s[i];
    if (c < '0' || c > '9')
      return false; }
  return true; }


int string_to_int(string s)
{ int value = 0;
  for (int i = 0; i < s.length(); i += 1)
    value = value * 10 + s[i] - '0';
  return value; }


struct in_sys
{ string line; 
  int pos; };

void reset(in_sys & i, string s)
{ i.line = s;
  i.pos = 0; }

char get_ch(in_sys & i)
{ if (i.pos >= i.line.length())
  { i.pos += 1;
    return '.'; }
  char result = i.line[i.pos];
  i.pos += 1;
  return result; }

void unget_ch(in_sys & i)
{ i.pos -= 1; }

char sneak_ch(in_sys & i)
{ if (i.pos > i.line.length())
    return '.';
  char result = i.line[i.pos];
  return result; }

string get_from(in_sys & i)
{ string s = "";
  char c = get_ch(i);
  if (c >= 'A' && c <= 'Z')
  { char c2 = sneak_ch(i);
    if (c2 < 'a' || c2 > 'z')
      return s + c;
    c2 = get_ch(i);
    return s + c + c2; }

  else if (c >= '0' && c <= '9')
  { while (c >= '0' && c <= '9')
    { s = s + c;
      c = get_ch(i); }
    unget_ch(i);
    return s; }

  else if (c == '.')
    return ".";

  else
  { cout << "Error in input\n";
    return "."; } }



int main()
{ element PT[150];
  const int maxatno = read_file(PT, 150);

  string s;
  cin >> s;
  in_sys input;
  reset(input, s);

  double total = 0.0, last_atwt = 0.0;
  bool ok = true;
  while (true)
  { string wanted = get_from(input);
    if (wanted == ".")
      break;

    if (looks_like_a_number(wanted))
    { int N = string_to_int(wanted);
      total += last_atwt * (N - 1);
      cout << "  multiplied by " << N << " gives " << last_atwt * N << "\n"; }

    else
    { element el = find_element(wanted, PT, maxatno);
      if (el.symbol == "*")
      { cout << wanted << " not found\n";
        ok = false; }
      else
      { print(el);
        total += el.atwt;
        last_atwt = el.atwt; } } }

  if (ok)
    cout << "\nMolecular weight = " << total << "\n"; }