x = 3141592653589793238462643383279502884197169399375105820974944592
y = 2718281828459045235360287471352662497757247093699959574966967627
x_1 = str(x)
y_1 = str(y)
a = []
for i in range(len(str(x))):
    a.append(int(x_1[i]))
b = []
for i in range(len(str(y))):
    b.append(int(y_1[i]))
#print (len(a))
#print (b)
def karatsuba(a,b):
    if len(a) == 1 and len(b) == 1:
        return a[0]*b[0]
    else:
        n_1 = len(a)/2
        n_2 = len(b)/2
        a = a[:-n_1]
        b = a[n_1:]
        c = b[:-n_2]
        d = b[n_2:]
        return karatsuba(a,c) + (karatsuba(a,d)+karatsuba(b,c)) + karatsuba(b,d)