#33919: ___問
try:
while True:
a,b,n=list(map(int,input().split(" ")))
if len(str(a/b))>=n+2:
print(float(int(a/b*10**n))/(10**n))
else:
print(str(float(int(a/b*10**n))/(10**n))+"0"*(n+2-len(str(a/b))))
except ValueError:
pass
測試出現OverflowError