#include <stdio.h>
#include <conio.h>

int calcGCD (int value1, int value2) {
    if (value2 == 0) {
        return value1;
    }
    else {
        return calcGCD(value2, (value1%value2));
    }
}
int main() {
    printf("%d\n", calcGCD(700,350));
    return 0;
}