import sys

def PrintDiv(a,b,n):
    a = int(a)
    b = int(b)
    c = abs(a) / abs(b)
    if ( a > 0  and  b < 0 ) or ( a < 0 and b > 0):
        sys.stdout.write(str("-"))
    for i in range(int(n)):
        a = abs(a)
        b = abs(b)
        sys.stdout.write(str(c))
        a -= b * c
        if a == 0:
            break
        a *= 10
        c = a / b
        if i == 0:
            sys.stdout.write(str("."))

a=raw_input()
b=raw_input()
n=raw_input()
PrintDiv(a,b,n)