#include <stdio.h>
int sum(int a[], int n)
{
if(n == 0)
return 0;
return a[n - 1] + sum(a, n - 1);
}
int main()
{
int n;
scanf("%d", &n);
int a[n];
for(int i = 0; i < n; i++)
{
scanf("%d", &a[i]);
}
printf("%d", sum(a, n));
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CgppbnQgc3VtKGludCBhW10sIGludCBuKQp7CiAgICBpZihuID09IDApCiAgICAgICAgcmV0dXJuIDA7CgogICAgcmV0dXJuIGFbbiAtIDFdICsgc3VtKGEsIG4gLSAxKTsKfQoKaW50IG1haW4oKQp7CiAgICBpbnQgbjsKICAgIHNjYW5mKCIlZCIsICZuKTsKCiAgICBpbnQgYVtuXTsKCiAgICBmb3IoaW50IGkgPSAwOyBpIDwgbjsgaSsrKQogICAgewogICAgICAgIHNjYW5mKCIlZCIsICZhW2ldKTsKICAgIH0KCiAgICBwcmludGYoIiVkIiwgc3VtKGEsIG4pKTsKCiAgICByZXR1cm4gMDsKfQ==