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    Change can be paid in $50 bills as well. So when vasya receives the $100 bill, he gives $50 + $25 as change.

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    This comment is hidden because it contains spoiler information about the solution

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    test6(LineTests)
    [25, 25, 25, 25, 50, 100, 50]
    expected:<[YES]> but was:<[NO]>

    This means that he does not have enough as he gets 4 €25's and has to give back 5 €25 back