#include<stdio.h>
    #include<math.h>
    int main() {
    	int a,d,n,i,tn;
    	int sum=0;
    	printf("Enter the first number of the A.P. series: ");
    	scanf("%d",&a);
    	printf("Enter the total numbers in the A.P. series: ");
    	scanf("%d",&n);
    	printf("Enter the common difference of A.P. series: ");
    	scanf("%d",&d);
    	sum = ( n * ( 2 * a + ( n -1 ) * d ) )/ 2;
    	tn = a + (n-1) * d;
    	printf("Sum of the series A.P.: ");
    	for (i=a;i<=tn; i= i + d ) {
    		if (i != tn)
    		             printf("%d + ",i); else
    		             printf("%d = %d ",i,sum);
    	}
    	return 0;
    }