#include <stdio.h>

int main(void)
{
	int N,i,sum;
	scanf("%d\n",&N);
	
	sum=0;
	long unsigned int A[50000];

	for (i=1;i<=N;i++){
		scanf("%d,",&A[i]);
		sum+=A[i];	
	};

	printf("%d\n",sum);

	return 0;

}