import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

v, t = input().split()
v = int(v[2:])
t = int(t)
ans = str(v * t)
if len(ans) < 5:
    ans = '0'
else:
    ans = ans[:-4]
print(ans)