ip.cpp

// NOTE: it is recommended to use this even if you don't understand the following code.

#include <iostream>
#include <fstream>
#include <stdio.h>
#include <assert.h>

using namespace std;
// input d
long long A[4], B[4];

int main() {
//  ifstream cin("input.txt");you want to read/write from files
//  ofstream cout("output.txt");

    assert(4 == scanf("%d.%d.%d.%d", &A[0], &A[1], &A[2], &A[3]));
    assert(4 == scanf("%d.%d.%d.%d", &B[0], &B[1], &B[2], &B[3]));
    
    // at this point, the arrays A and B contain four elements each with the individual IP octects
    // for example: 192.168.1.1 creates an array [192, 168, 1, 1] with 192 at index 0

    // insert your code here
    unsigned long long int ans;
	
	ans = (B[3] + B[2]*256 + B[1]*256*256 + B[0]*256*256*256) - (A[3] + A[2]*256 + A[1]*256*256 + A[0]*256*256*256) +1;
	
    printf("%lld\n", ans);  // print the result
    return 0;
}