#include <stdio.h>
 
void kakunin1(int a) {
}
 
void kakunin2(int a) {
    kakunin1(a);
}
 
void kakunin3(int a) {
    kakunin2(a);
}
 
int main(void) {
    int a;
    a = 0;
    kakunin3(a);
    a = 40;
    kakunin3(a);
    a = 100;
    kakunin3(a);
    return 0;
}
 
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