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#include <iostream>
#include <vector>

using namespace std;


int main(){
    const int SIZE = 201800; // +1
    //const int SIZE = 10;
    int n;
    scanf("%d", &n);
    vector<int> TAB(SIZE);
    int highest = 0;
    int wynik;

    for(int i = 0; i< n; i++){
        int temp;
        scanf("%d", &temp);
        TAB[temp]+=1;
        highest = max(highest, temp);
    }

    for(int i = 0; i<SIZE-1; i++){
        if(TAB[i]>1){
            TAB[i+1] += (int)(TAB[i]/2);
            TAB[i] = TAB[i]%2;
        }
    }
    for(int i = 0; i < SIZE; i++){
        if(TAB[i]!=0){
            wynik = i;
        }
    }

    printf("%d", wynik);


    return 0;

}