There is a box of chalks, 3 pieces of chalk are 1 less than 3 pieces; 4 pieces of 4 pieces are less than 1 piece, and 5 pieces of 5 pieces are also less than 1 piece. How many pieces of chalk are there at least in this box?
有一盒粉笔，3支3支地数少1支；4支4支地数少1支，5支5支地数也少1支，这盒粉笔至少有多少支？
<gadget id="calculator">3 * 4 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<result>59</result>