#include <stdio.h>
int main(){
    int  n,a,b,e=2;
    for(b=1;b<=n;scanf("%d ",&arr[b++]));
    int arr[b];
    if(b<=0){
        printf("Invalid Input");
        return 0;
    }
    a =b^e;
    printf("%d ",&a);
    return 0; 
}