bzoj 1968 数学

/**************************************************************
    Problem: 1968
    User: BLADEVIL
    Language: C++
    Result: Accepted
    Time:32 ms
    Memory:804 kb
****************************************************************/
 
//By BLADEVIL
#include <cstdio>
 
int n,ans;
 
int main(){
    scanf("%d",&n);
    for (int i=1;i<=n;i++) ans+=n/i;
    printf("%d\n",ans);
    return 0;
}