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

int main() {
    unsigned int len;
    int i, sammud;
    int *jada;
    int max_moves;
    int liikuda;    
    int lahend = 0;
    FILE *f;
    
    liikuda = sammud = 0;
    
    f = fopen("jada.sis", "r");
    if(!f) {
        FILE *fout = fopen("jada.val", "w");
        fprintf(fout, "jada.sis ei leitud");
        fclose(fout);
        return 0;
    }

    fscanf(f, "%d", &len);
    max_moves = len + 25;
    jada = (int *)malloc(sizeof(int) * len);
    for(i=0;i<len;i++) {
        fscanf(f, "%d ", &jada[i]);
    }
    fclose(f);
    liikuda = 1;
    while(sammud < max_moves) {
        sammud++;
        if(liikuda > len) { /* jadast väljas */
                lahend = 0;
                break;
        }
        liikuda = jada[liikuda-1];
        if(liikuda == 1) { /* jõuame algusesse */
                lahend = 1;
                break;
        }

    }

    f = fopen("JADA.VAL", "w");
    if(lahend == 1) {
        fprintf(f, "JAH\n%d", sammud);
    } else {
        fprintf(f, "EI");
    }
    fclose(f);
}