C++ OLIMP pomidoras

#include <fstream>
#include <iostream>

using namespace std;

int main()
{
    ifstream fd("pomidorai.in");
    ofstream fr("pomidorai.out");
    int n = 0, m = 0, d = 0, nx = 0;
    fd >> n >> m >> d;
    cout << n << m << d;
    int P[100];
    for (int i = 1; i <= n; i++){
        if(i==m){
            P[i] = 1;}
            else{
                P[i] = 0;}
    }
    for (int i = 1; i <= d; i++){
        P[m-i] = 1;
        P[m+i] = 1;
    }
    for (int i = 1; i <= n; i++){
        if (P[i] == 0) {
        nx++;
        }
    }
    cout << nx;
    fr << nx;
    return 0;
}