DIGIT PROBLEM EASY

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Chef is playing a game. For some reason he likes $7$ and hates $0$ . So he starts from an integer $L$ if he finds $7$ on the digit of this number and it does not contain $0$ he considered it as magical number. He continues upto $R$. He plays the game for $N$ times. Can you help the chef to find how many magical number exists in the range $L$ to $R$. ###Input: - First line will contain $N

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solution.cppC++17

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