If there are seven friend's A, B, C, D, E, F, G . The group of friend's won control over 'n' number of Barbarian's in the other Castle. If two of them decide to divide 'n' then one barbarian remains mean n is not divisible in 2. Then 3 friends decide to divide 'n' again same problem one is left and this problem continue up-to seven. Tell me the value of 'n' :Total number of barbarians.