#include <stdio.h>

void main(void){
    int n;
    scanf("%d",&n);
    int numList[100000] = {};
    for(int i = 1 ; i <= n ; i++){
        numList[n/i]++;
    }
    int count = 0;
    for(int i = 1 ; i <= n ; i++){
        if(numList[i] != 0){
            count++;
        }
    }
    printf("%d",count);
}