1064A - Make a triangle

#include <iostream>

#include<vector>

#include<string>

#include<math.h>

#include<set>

#include<map>

#include<stack>

#include<queue>

#include<algorithm>

/* ==================================================

  |                                                  |

  |    Author: *** S. M. Sabiul Hajjaj Sabit ***     |

  |       Last Edit:  May,14,2019                    |

   ================================================== */

///***global declaration***///

#define all(arr) arr.begin(),arr.end()

#define pb push_back

#define sz(x) x.size()

#define min3(a,b,c)  min(min(a,b),c)

#define max3(a,b,c)  max(max(a,b),c)

using namespace std;

int i,j,n,m,sum=0,ans=0;

template <typename T>long long int power(T a, T b)

{

    long long int pow=1;

    for(int i=0; i<b; i++)

    {

        pow *= a;

    }

    return pow;

}

///*********Write Code From Here*********///

int main()

{

    int a,b,c;

    cin>>a>>b>>c;

    if(a+b>c && a+c>b && b+c>a)

    {

        cout<<0<<endl;

    }

    else

    {

        int _1st = min3(a,b,c);

        int _3rd= max3(a,b,c);

        int _2nd = (a+b+c) -(_1st+_3rd);

        cout<<_3rd -(_1st +_2nd)+1<<endl;

    }

}