#include using namespace std; int main(){ int K; scanf("%d",&K); int a,b,c,d,e; a=0; while(!(a*(a-1)/2 <= K && K < a*(a+1)/2)) a++; a = a*(a-1)/2; K = K - a; if(K >= 10){ b = 10; d = K % 10; e = K / 10 - 1; } else { b = 0; d = K; e = 0; } c = 1; int N = a+b+c+d+e; printf("%d\n",N); for(int i=0;i