#include <iostream>
#include <cmath>

int main() {
    int a, b;
    std::cin >> a >> b;

    // 计算第三边的取值范围
    int lower_bound = std::abs(a - b) + 1;
    int upper_bound = a + b - 1;

    // 计算第三边可能的取值数量
    int count = upper_bound - lower_bound + 1;

    std::cout << count << std::endl;

    return 0;
}    
/**************************************************************
	Problem: 1525
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:38 ms
	Memory:2072 kb
****************************************************************/