Problem G. Bomb
时间限制 1000 ms
内存限制 64 MB
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?
输入数据
输出数据
For each test case, output an integer indicating the final points of the power.
样例输入
样例输出
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