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

#define True 1
#define False 0
#define N 15
#define MAX_DIFF 1000000000000000001

void print_a(unsigned long long a[N])
{
    int i;
    printf("\n----------------\n");
    for (i = 0; a[i] != 0; i++) {
        printf("%llu\n", a[i]);
    }
    printf("\n--------------\n");
}

void sort(unsigned long long a[N])
{
    int i, j, s_fl;
    unsigned long long tmp;
    for (i = 0, s_fl = True; s_fl == True; i++) {
        for (j = 0, s_fl = False; j < N-i-1; j++) {
            if (a[j] < a[j + 1]) {
                s_fl = True;
                tmp = a[j];
                a[j] = a[j + 1];
                a[j + 1] = tmp;
            }
        }
    }
}


int main(int argc, char *argv[])
{
    int i, j, c;
    unsigned long long prev, diff;
    unsigned long long max[N] = {0};
    for (i = 0; i < 3; i++)
        scanf("%llu", &max[i]);

    sort(max);

    for (j = 2, c = 0; max[j] != 0; j++, c++) {
        for (i = 0, diff = MAX_DIFF; max[i + 1] != 0; i++) {
        prev = max[i] - max[i + 1];
        if (prev < diff)
            diff = prev;
        }
        max[j + 1] = diff;
        sort(max);
    //    print_a(max);
    }

    printf("%d\n", c);

    return 0;
}