#include<stdio.h>
void main()
int input()
{
    0<= a1,a2<= 180;  
    a1+a2>=180;
    a1=60;
    a2=60;
        printf("%d",a1+a2=180);
        scanf(%d,a1+a2)
        printf("Invalid input");
    
    return 0;
}