Number of Diamonds?

amonds? by Abhi Singla Seven thiefs theft diamonds from a shop, they want to devide it equally, after a long argument they tired and sleep on a beach , when all are sleeping two of them wake up and they want it equal equal when they distribute it one diamond is left between them so they wake one more and again distribute it and one diamond is again left and this happen repeatedly until seven of them wake Up, in the end they distribute it equally. What's is the amount of diamonds?????