'''input'''
i1=lambda:int(s1())
i2=lambda:map(int,s2())
il=lambda:list(i2())
s1=lambda:input()
s2=lambda:s1().split()
sl=lambda:list(s2())
'''output'''
'''createList'''
cl=lambda x,d:[d for i in range(x)]# a=c2l(10,23,"x")
'''code'''
import math
A,B,X=i2()
c=math.ceil(X/A)
print(c*B)