Spartacus1-
The world is yours
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A prisoner in a jail cell, surrounded by gold coins. He offers the guard at the door a coin and he opens the door. He tells him that there are 9 guards in total and they will let him pass them once for one coin. Each time he passes one he must pay the toll, even if he's going back. He is not allowed to take more than 4 coins with him, but he may store coins in front of any door. What is the minimum number of coins that must be in the cell in order to bribe all the guards and escape?