How to add 4 digits without using a loop

#include<stdio.h>
int main(){
	int a,b,c,d,sum;
	printf("Enter the 4 subject marks:");
	scanf("%d%d%d%d%d",&a,&b,&c,&d);
	sum=a+b+c+d;
	printf("Total Marks is:%d",sum);
	if(sum>=50){
		printf("passing");
	}
	else{
		printf("failing");	
	}
	return 0;
}

#include<stdio.h>
int main(){
	int a,b,c,d,sum;
	printf("Enter the 4 subject marks:");
	scanf("%d%d%d%d%d",&a,&b,&c,&d);
	sum=a+b+c+d;
	printf("Total Marks is:%d",sum);
	if(sum>=50){
		printf("passing");
	}
	else{
		printf("failing");	
	}
	return 0;
}