#include<stdio.h>
int main(){
    int A[20],n,i;
    int valid = 2;  // 2 for unused value
    int count = 0;
    printf("Enter number of inputs :");
    scanf("%d",&n);
    if(n >= 2){
        printf("Enter %d inputs (0 or 1) :\n", n);
        for (int j = 1; j <= n; j++)
        {
            scanf("%d", &A[j]);
        }
        for (i = 1;i <= n;i++){
            switch(A[i]){
                case 1:
                {
                    count++;
                    break;
                }
                case 0:
                {
                    count++;
                    break;
                }
            }
        }
        if (count%3 == 0)
        {
            valid = 1;
        }
        else
        {
            valid = 0;
        }
    }
    else{
        printf("Your inputs should be atleast 2.\n");
    }
    switch(valid){
        case 1:
        {
            printf("Congrats, Your string is valid \n");
            break;
        }
        case 0:
        {
            printf("Your string is not valid\n");
            break;
        }
    }
    return 0;
}