Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Osman Ay.
Molecules
A molecule is a chemical structure that is
made up of more than one atom. H2O is the molecule of water. It contains two
hydrogen and one oxygen atoms. The weight of hydrogen is 1, and the weight
of oxygen is 16. Thus the weight of water molecule is 2*1 + 16*1 = 18.
Question:
Write a program that
calculates the mass of a molecule.
Input specification
The first line of the input contains an integer (n) that denotes the number of the
atoms in the molecule where n i between 1 and 100. Each of the following n lines denotes an atom of the
molecule with two integers. The first integer is the mass of the atom, and the
second integer is the quantity of the atom.
Output specification
Show just one integer number: total weight of the molecule.
Sample Input I
2
1 2
16 1
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Sample Output I
18
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Для отправки решений необходимо выполнить вход.
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