#include <stdio.h>
int main() {
int n, soma=0;
scanf("%d", &n);
int v[n];
for(int i=0; i<n; i++){
scanf("%d", &v[i]);
}
for(int i=1; i<n; i++){
if(v[i]==0){
for(int j=i-1;j>=0; j--){
if(v[j] != 0){
v[j] = 0;
break;
}
}
}
}
for(int i=0; i<n; i++){
soma = soma+v[i];
}
printf("%d", soma);
return 0;
}
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