#include <stdio.h>
int main() {
int n,sum=0,constructor;
int no_con=1;
scanf("%d",&n);
for (int i=1; i<n; i++) {
constructor=i;
sum=constructor;
while(constructor>0) {
sum+=constructor%10;
constructor=constructor/10;
}
if(sum==n) {
printf("%d",i);
return 0;
}
}
if(no_con) {
printf("0");
}
return 0;
}
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