249984
......
$\left \lfloor \frac{1000000}{5} \right \rfloor+\left \lfloor \frac{1000000}{5^{2}} \right \rfloor+\left \lfloor \frac{1000000}{5^{3}} \right \rfloor+\left \lfloor \frac{1000000}{5^{4}} \right \rfloor+\left \lfloor \frac{1000000}{5^{5}} \right\rfloor$
$+\left \lfloor \frac{1000000}{5^{6}} \right \rfloor+\left \lfloor \frac{1000000}{5^{7}} \right \rfloor+\left \lfloor \frac{1000000}{5^{8}} \right \rfloor+\left \lfloor \frac{1000000}{5^{9}} \right \rfloor$
$=\left \lfloor 200000 \right \rfloor+\left \lfloor 40000 \right \rfloor+\left \lfloor 8000 \right \rfloor+\left \lfloor 1600\right \rfloor+\left \lfloor320 \right\rfloor$
$+\left \lfloor64 \right \rfloor+\left \lfloor12.8 \right \rfloor+\left \lfloor 2.56 \right \rfloor+\left \lfloor0.512 \right \rfloor$
$=200000+40000+8000+1600+320+64+12+2+0=249998$
; 06-05-2016 11:07 PM
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