#include <stdio.h>
#include <stdlib.h>

int main() {

    int n, i, x;
    int db0 = 0, db1 = 0;

    scanf("%d", &n);

    for (i = 0; i < n; i++) {
        scanf("%d", &x);
        db0 += (1 - x);
        db1 += x;
    }

    if (db0 > db1) {
        printf("%d", db0 - n/2);
    }
    else {
        printf("%d", db1 - n/2);
    }

    return 0;
}