typedef unsigned int uint;

uint two_arrays(uint N){
    uint data[N];
    bool mask[N];
    unsigned int total = 0;

    // Initialise data
    for(uint i=0; i<N; i++){
        data[i] = i;
        mask[i] = false;
    }

    // Actual computations
    for (uint i=2; i<N; i++){
        if (mask[i] == false){
            for (uint j=2*i; j<N; j+=i){
                mask[j] = true;
            }
        }
    }

    // Count the number.
    for (uint i=2; i<N; i++){
            if (mask[i] == false)
                total+=data[i];
    }
    return total;
}


uint array_of_structs(uint N){
    struct {
        unsigned int value;
        bool mask;
    } numbers[N];

    unsigned int total = 0;

    // Initialise data
    for(uint i=0; i<N; i++){
        numbers[i].value = i;
        numbers[i].mask = false;
    }

    // Actual computations
    for (uint i=2; i<N; i++){
        if (numbers[i].mask == false){
            for (uint j=2*i; j<N; j+=i){
                numbers[j].mask = true;
            }
        }
    }

    // Count the number.
    for (uint i=2; i<N; i++){
        if (numbers[i].mask == false){
            total+=numbers[i].value;
        };
    }

    return total;
}