A,B = input().split()

A = int(A)

B = B.replace('.','')

B = int(B)



print((A*B//100))



A,B = input().split()

from decimal import Decimal,ROUND_DOWN

A = Decimal(A)

B = Decimal(B)

N = A*B

print((N.quantize(Decimal('1'),rounding=ROUND_DOWN)))

A, B = input().split()
A = int(A)
B = B.replace(".", "")
B = int(B)
print((A * B // 100))

A, B = input().split()
from decimal import Decimal, ROUND_DOWN

A = Decimal(A)
B = Decimal(B)
N = A * B
print((N.quantize(Decimal("1"), rounding=ROUND_DOWN)))

-A = int(A) -B = B.replace(".", "") -B = int(B) -print((A * B // 100)) +from decimal import Decimal, ROUND_DOWN + +A = Decimal(A) +B = Decimal(B) +N = A * B +print((N.quantize(Decimal("1"), rounding=ROUND_DOWN)))