#include<stdio.h>


#define DEBUG


int main() {

#ifdef DEBUG
	printf("Debug mode is ON\n");
#endif
	int S=0;
	for(i=1;i<=20;i++){ 
		S=S+i;
#ifdef DEBUG
		printf("Intermediate Sum=%d\n",S);
#endif
	}
	printf("Final sum=%",S);

	return 0;
}