#include<stdio.h>

int main(void){
    
    int C[265];
    int i,j;
    
    for(i=0,j=0;i<100;i++,j++){
        if(i<10){
            C[j]=i; }
        else{
            C[j]=i/10;
            j++;
            C[j]=i%10;}
        if(i==100){
            C[j]=i/100;
            j++;
            C[j]=i/10;
            j++;
            C[j]=i%100;
            break;} }
    
    int n;
    scanf("%d",&n);
 
    printf("%d\n",C[n]);
    
    return 0;
    
}