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#include <iostream>
#include <vector>
#include <cmath>

std::vector<int> getInput(){
    int info;
    std::vector<int> coins;
    std::cin >> info;
    uint64_t val;
    for (int i=0; i<info; i++){
        std::cin >> val;
        coins.push_back(val);
    }
    return coins;
}

uint64_t getValue(const int& num){
    return (1<<num);
}

short getPower(const uint64_t& num){
    return std::log2(num);
}

int main(){
    std::vector<int> coins = getInput();
    uint64_t sum = 0;
    for (const int& coin : coins){
        sum += getValue(coin);                                                                                                          
    }   
    short sumPow = getPower(sum);
    std::cout << sumPow << "\n";
    return sumPow;
}