import time
import sys
f=open('in6_8.txt','r')
x=f.readline()

y=x.index(",")
f.close()
m=int(x[0:y])
n=int(x[y+1:len(x)])
j=time.clock()
a=(1-m**n)/(1-m)
output=open('out_28_6_8.txt','w')
output.write(str(a))
t=time.clock()
output.write('\nTime used='+str(t-j))
output.write('\nNo. of additions=0')
output.write('\nNo. of Multiplications=0')
mem=sys.getsizeof(x)+sys.getsizeof(n)+sys.getsizeof(m)
output.write('\nMemory used='+str(mem))
output.close()