#include <bits/stdc++.h>   using namespace std;   const int inf = 0x3f3f3f3f;   const long long linf = 0x3f3f3f3fLL;   int main() {     int n;     scanf( %d , &n);     if (n < 10)       puts( 1 );     else {       int aux = n;       while (aux >= 10) {         aux /= 10;       }       int num = aux + 1;       aux = n;       while (aux >= 10) {         aux /= 10;         num *= 10;       }       printf( %d n , num - n);     }     return 0;   }   