#include <stdio.h>
int main()
{
    int n, c, m, *pc, *pm, i, j, cont;
    while(scanf("%d %d %d", &n, &c, &m) == 3)
    {
        cont = 0;
        pc = malloc(c*sizeof(int));
        pm = malloc(m*sizeof(int));
        for(i = 0; i < c; ++i)
        {
            scanf("%d ", &pc[i]);
        }
        for(i = 0; i < m; ++i)
        {
            scanf("%d ", &pm[i]);
        }
        for(i = 0; i < c; ++i)
        {
            for(j = 0; j < m; ++j)
            {
                if(pc[i] == pm[j])
                {
                    cont++;
                    break;
                }
            }
        }
        printf("%d\n", c - cont);
    }
    return 0;
}