first commit of problem 5

problem link = http://projecteuler.net/problem=5
first commit of problem 6

problem link = http://projecteuler.net/problem=6
first commit of problem 7

problem link = http://projecteuler.net/problem=7
first commit of problem 8

problem link = http://projecteuler.net/problem=8
first commit of problem 9

problem link = http://projecteuler.net/problem=9
first commit of problem 10

problem link = http://projecteuler.net/problem=10