from math import *
from numpy import *

def new_big_int (inp):
    slots = int(log10(inp))
    slots += 10 - slots%10
    big_int = []
    for n in range(slots+1):
        big_int.append(0)
    i = slots
    j = 0
    big_int[i] = inp
    while i > 0:
        if big_int[i] > 9:
            j = floor(big_int[i]/10);
            big_int[i] -= j*10
            big_int[i-1] += j
        i -= 1
    return big_int


def add_big_int (big_int,big_int2):
    i = len(big_int)-1
    j = len(big_int2)-1
    k = i >= j
    if k:
        while j > -1:
            big_int[i] += big_int2[j]
            if big_int[i] > 9:
                k = floor(big_int[i]/10);
                big_int[i] -= k*10
                big_int[i-1] += k
            j-=1
            i-=1
    else:
        while i > -1:
            big_int2[j] += big_int[i]
            if big_int2[j] > 9:
                k = floor(big_int2[j]/10);
                big_int2[j] -= k*10
                big_int2[j-1] += k
            j-=1
            i-=1
        big_int = big_int2
    return big_int

def sub_big_int (big_int,big_int2):
    i = 0
    if len(big_int) >= len(big_int2):
        k = len(big_int)
        m = 1
    else:
        k  =len(big_int2)
        m = 2
    big_out = []
    if m ==1 :
        k = len(big_int)-len(big_int2)
        while k > 0:
            big_int2.insert(0,0)
            k -= 1
    else:
        k = len(big_int2) - len(big_int)
        while k > 0:
            big_int.insert(0,0)
            k -= 1
    k = len(big_int)
    while k > 0:
        big_out.append(0)
        k -= 1
    i = 0
    k = len(big_int)-1
    for i in range(0,k):
        big_out[i] = big_int[i] - big_int2[i]
        i += 1
    i = k
    while i > 1:
        if big_out[i] < 0:
            big_out[i] += 10
            big_out[i-1] -= 1
        i -= 1
    return big_out

def print_big (big_int):
    out_string = ''
    for i in range(len(big_int)):
        out_string += str(int(big_int[i]))
    print(out_string)

def mult_big (big_int3, inp):
    big_int4 = big_int3
    big_out2 = []
    k = len(big_int3)
    while k > 0:
        big_out2.append(0)
        k -= 1
    for i in range(inp-1):
        big_out2 += add_big_int(big_int3,big_int4)
    return big_out2

IntA = new_big_int (300)
IntB = new_big_int (750)
print_big (IntA)
print_big (IntB)
IntA = add_big_int (IntA,IntB)
print_big (IntA)
IntB = sub_big_int(IntA,IntB)
print_big (IntB)
IntA = new_big_int (500)
print_big (IntA)
IntA = mult_big (IntA, 20)
print_big(IntA)

00000000300
00000000750
00000001050
00000000300
00000000500
0000000000000000002000000000040000000000800000000026000000000620000000022400000000448000000020060000000402200000008044000000260880000006228600000224682000004604640000202202800004044066000080882420002628648400062684068000

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(Program executed with code: 0)
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