def find_smallest_int(arr):
    return min(arr)

print find_smallest_int([78, 56, 232, 12, 11, 43]) == 11
print find_smallest_int([78, 56, -2, 12, 8, -33]) == -33
print find_smallest_int([0, 1 - 2**64, 2**64]) == 1 - 2**64