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#include <iostream>
#include <stdio.h>
#include <vector>
using namespace std;

void setBit(vector<bool> &bits, int n, int val);

int main() {
	unsigned long long i = 0;
	unsigned long long n;
	unsigned long long val = 0;
	scanf("%llu", &n);

	vector<bool> bits;

	for(i = 0 ; i < n ; i++) {
		scanf("%llu", &val);
		setBit(bits, val, 1);
	}

	val = bits.size() - 1;
	printf("%llu", val);

	return 0;
}

void setBit(vector<bool> &bits, int n, int val) {
	while(bits.size() <= n) {
		bits.push_back(false);
	}
	if(val == 1 && bits.at(n) == 1) {
		bits.at(n) = 0;
		setBit(bits, n + 1, 1);
	} else {
		bits.at(n) = val;
	}
}