Problem - 3555 The counter-terrorists found a time bomb in the dust. But this time the terrorists improve...

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Problem - 3555

The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49", the power of the blast would add one point.

Now the counter-terrorist knows the number N. They want to know the final points of the power. Can you help them?

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Problem - 3555







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