#include <stdio.h>

int main(void)
{
    int n, zino = 1, t = 0;
    freopen("skambuciai.in", "r", stdin);
    freopen("skambuciai.out", "w", stdout);
    scanf("%d", &n);
    while (zino < n) {
        zino *= 2;
        t++;
    }
    printf("%d\n", t);
    return 0;
}