#include <stdio.h>
int func(int num){
if(num==1){
num = 2;
return num;
}
if(num==2){
num = 3;
return num;
}
if(num==3){
num = 5;
return num;
}
if(num==4){
num = 7;
return num;
}
if(num==5){
num = 11;
return num;
}
else
num = -1;
return num;
}
int main(void){
int num, prime;
prime = func(num);
if(prime > 0)
prime);
else
return 0;
}
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