pl tell me the error the output i want is yes after 2 consecutive 5

Question

#include <stdio.h>

int main()

{
int i,a[5];
for(i=0;i<=4;i++)
{
scanf("%d",&a[i]);
if(a[i]==5)
{
if(a[i+1]==a[i])
{
printf("yes");
}
}
}
return 0;
}