#include<iostream>#include<cstdio>#define MN 1000000#define ll long longusing namespace std;inline int read(){    int x = 0 , f = 1; char ch = getchar();    while(ch < ‘0‘ || ch > ‘9‘){ if(ch == ‘-‘) f = -1;  ch = getchar();}    while(ch >= ‘0‘ && ch <= ‘9‘){x = x * 10 + ch - ‘0‘;ch = getchar();}    return x * f;}int n;ll ans=0;int main(){    n=read();    for(int i=1;i<=n;i++)        ans+=n/i;    printf("%lld\n",ans);    return 0;}